Words API

Words API is a RESTful English-language API that provides definitions, synonyms, antonyms, related words, syllables, pronunciation (IPA), rhymes, frequency, and hierarchical lexical relationships (typeOf, hasTypes, partOf, hasParts, memberOf, similarTo, also, entails, inCategory, inRegion, pertainsTo, etc.) for more than 150,000 English words. Distributed and metered through the RapidAPI marketplace.

Words API publishes 9 APIs on the APIs.io network, including Categories API, Definitions API, Examples API, and 6 more. Tagged areas include Dictionaries, Linguistics, English, Thesaurus, and Lexical Data.

The Words API catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

Words API’s developer surface includes authentication, documentation, signup flow, pricing, engineering blog, and 14 more developer resources.

🌐 Visit website 📡 Source on GitHub

51.8/100 developing ▼ -7.7 Agent 34/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6

AccessPaidSelf serve

9 APIs 11 Features 8 Use Cases

DictionariesLinguisticsEnglishThesaurusLexical DataPublic APIs

Kin Score

Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6

Composite quality — 51.8/100 · developing

Contract Quality 16.2 / 25

Developer Ergonomics 4.3 / 20

Commercial Clarity 10.0 / 20

Operational Transparency 4.8 / 13

Governance 8.3 / 12

Discoverability 8.2 / 10

Agent readiness — 34/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/words: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 9

Individual APIs this provider publishes, each with its own machine-readable definition.

Words API Categories API

Words API Category, Region, and Domain-Usage Relationships.

Words API Definitions API

Words API Sense-level Definitions Grouped by Part of Speech.

Words API Examples API

Words API Real-world Example Sentences for Each Sense.

Words API Frequency API

Words API Corpus-derived Frequency Statistics (Zipf, perMillion, diversity).

Words API Hierarchy API

Words API Lexical Hierarchies — typeOf, hasTypes, partOf, hasParts, instances.

Words API Phonetics API

Words API Pronunciation (IPA), Syllables, and Rhymes.

Words API Search API

Words API Search and Random Word Discovery Endpoint.

Words API Thesaurus API

Words API Synonyms, Antonyms, and Similar Word Relationships.

Words API Word API

Words API Lookup a Word and Retrieve Its Full Lexical Entry.

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Open Collections 1

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

Words API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Words Plans Pricing

5 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Words Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Words Finops

FINOPS

Features 11

Notable capabilities this provider offers.

150,000+ English Words

Definitions, syllables, pronunciation, and lexical relationships across more than 150,000 English words.

Definitions and Parts of Speech

Per-sense definitions grouped by part of speech (noun, verb, adjective, adverb).

Thesaurus (Synonyms and Antonyms)

Interchangeable and opposite-meaning words for each sense of a word.

Lexical Hierarchies

typeOf, hasTypes, partOf, hasParts, instanceOf, hasInstances, memberOf, hasMembers, substanceOf, hasSubstances, inCategory, hasCategories relationships.

Pronunciation in IPA

International Phonetic Alphabet pronunciation, optionally split per part of speech.

Syllable Breakdown

Syllable count and the ordered list of syllables for each word.

Rhymes

Lists of rhyming words, distinguished by pronunciation variant where pronunciations differ.

Frequency Data

Zipf frequency (1–7), per-million occurrence rate, and corpus diversity score derived from large English subtitle corpora.

Examples

Sample sentences illustrating real usage for each sense.

Regional and Domain Usage

inRegion, regionOf, inCategory, hasCategories, usageOf, hasUsages relationships connect words to dialects and subject domains.

Random and Filtered Word Search

/words search endpoint supports letter count, letter pattern, phoneme count, IPA pattern, part of speech, and random selection.

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Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Words Context

36 classes · 48 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Words API API Rules

5 rules · 3 warnings 2 info

SPECTRAL

Words API API Rules

32 rules · 13 errors 18 warnings 1 info

SPECTRAL

JSON Schema 36

Standalone JSON Schema definitions for this provider's data models.

AlsoResponse

2 properties

JSON SCHEMA

AntonymsResponse

2 properties

JSON SCHEMA

DefinitionEntry

2 properties

JSON SCHEMA

DefinitionsResponse

2 properties

JSON SCHEMA

EntailsResponse

2 properties

JSON SCHEMA

ExamplesResponse

2 properties

JSON SCHEMA

FrequencyResponse

0 properties

JSON SCHEMA

Frequency

3 properties

JSON SCHEMA

HasCategoriesResponse

2 properties

JSON SCHEMA

HasMembersResponse

2 properties

JSON SCHEMA

HasPartsResponse

2 properties

JSON SCHEMA

HasSubstancesResponse

2 properties

JSON SCHEMA

HasTypesResponse

2 properties

JSON SCHEMA

HasUsagesResponse

2 properties

JSON SCHEMA

InCategoryResponse

2 properties

JSON SCHEMA

InRegionResponse

2 properties

JSON SCHEMA

InstanceOfResponse

2 properties

JSON SCHEMA

InstancesResponse

2 properties

JSON SCHEMA

MemberOfResponse

2 properties

JSON SCHEMA

PartOfResponse

2 properties

JSON SCHEMA

PertainsToResponse

2 properties

JSON SCHEMA

PronunciationResponse

2 properties

JSON SCHEMA

Pronunciation

5 properties

JSON SCHEMA

RegionOfResponse

2 properties

JSON SCHEMA

Result

25 properties

JSON SCHEMA

RhymesResponse

2 properties

JSON SCHEMA

SearchResponse

3 properties

JSON SCHEMA

SearchResultsMeta

3 properties

JSON SCHEMA

SimilarToResponse

2 properties

JSON SCHEMA

SubstanceOfResponse

2 properties

JSON SCHEMA

SyllablesResponse

3 properties

JSON SCHEMA

Syllables

2 properties

JSON SCHEMA

SynonymsResponse

2 properties

JSON SCHEMA

TypeOfResponse

2 properties

JSON SCHEMA

UsageOfResponse

2 properties

JSON SCHEMA

WordEntry

5 properties

JSON SCHEMA

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JSON Structure 36

JSON Structure definitions describing this provider's data shapes.

Words Also Response Structure

2 properties

JSON STRUCTURE

Words Antonyms Response Structure

2 properties

JSON STRUCTURE

Words Definition Entry Structure

2 properties

JSON STRUCTURE

Words Definitions Response Structure

2 properties

JSON STRUCTURE

Words Entails Response Structure

2 properties

JSON STRUCTURE

Words Examples Response Structure

2 properties

JSON STRUCTURE

Words Frequency Response Structure

0 properties

JSON STRUCTURE

Words Frequency Structure

3 properties

JSON STRUCTURE

Words Has Categories Response Structure

2 properties

JSON STRUCTURE

Words Has Members Response Structure

2 properties

JSON STRUCTURE

Words Has Parts Response Structure

2 properties

JSON STRUCTURE

Words Has Substances Response Structure

2 properties

JSON STRUCTURE

Words Has Types Response Structure

2 properties

JSON STRUCTURE

Words Has Usages Response Structure

2 properties

JSON STRUCTURE

Words In Category Response Structure

2 properties

JSON STRUCTURE

Words In Region Response Structure

2 properties

JSON STRUCTURE

Words Instance Of Response Structure

2 properties

JSON STRUCTURE

Words Instances Response Structure

2 properties

JSON STRUCTURE

Words Member Of Response Structure

2 properties

JSON STRUCTURE

Words Part Of Response Structure

2 properties

JSON STRUCTURE

Words Pertains To Response Structure

2 properties

JSON STRUCTURE

Words Pronunciation Response Structure

2 properties

JSON STRUCTURE

Words Pronunciation Structure

5 properties

JSON STRUCTURE

Words Region Of Response Structure

2 properties

JSON STRUCTURE

Words Result Structure

25 properties

JSON STRUCTURE

Words Rhymes Response Structure

2 properties

JSON STRUCTURE

Words Search Response Structure

3 properties

JSON STRUCTURE

Words Search Results Meta Structure

3 properties

JSON STRUCTURE

Words Similar To Response Structure

2 properties

JSON STRUCTURE

Words Substance Of Response Structure

2 properties

JSON STRUCTURE

Words Syllables Response Structure

3 properties

JSON STRUCTURE

Words Syllables Structure

2 properties

JSON STRUCTURE

Words Synonyms Response Structure

2 properties

JSON STRUCTURE

Words Type Of Response Structure

2 properties

JSON STRUCTURE

Words Usage Of Response Structure

2 properties

JSON STRUCTURE

Words Word Entry Structure

5 properties

JSON STRUCTURE

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Examples 36

Example request and response payloads for these APIs.

Words Also Response Example

2 fields

EXAMPLE

Words Antonyms Response Example

2 fields

EXAMPLE

Words Definition Entry Example

2 fields

EXAMPLE

Words Definitions Response Example

2 fields

EXAMPLE

Words Entails Response Example

2 fields

EXAMPLE

Words Examples Response Example

2 fields

EXAMPLE

Words Frequency Example

3 fields

EXAMPLE

Words Frequency Response Example

0 fields

EXAMPLE

Words Has Categories Response Example

2 fields

EXAMPLE

Words Has Members Response Example

2 fields

EXAMPLE

Words Has Parts Response Example

2 fields

EXAMPLE

Words Has Substances Response Example

2 fields

EXAMPLE

Words Has Types Response Example

2 fields

EXAMPLE

Words Has Usages Response Example

2 fields

EXAMPLE

Words In Category Response Example

2 fields

EXAMPLE

Words In Region Response Example

2 fields

EXAMPLE

Words Instance Of Response Example

2 fields

EXAMPLE

Words Instances Response Example

2 fields

EXAMPLE

Words Member Of Response Example

2 fields

EXAMPLE

Words Part Of Response Example

2 fields

EXAMPLE

Words Pertains To Response Example

2 fields

EXAMPLE

Words Pronunciation Example

5 fields

EXAMPLE

Words Pronunciation Response Example

2 fields

EXAMPLE

Words Region Of Response Example

2 fields

EXAMPLE

Words Result Example

25 fields

EXAMPLE

Words Rhymes Response Example

2 fields

EXAMPLE

Words Search Response Example

3 fields

EXAMPLE

Words Search Results Meta Example

3 fields

EXAMPLE

Words Similar To Response Example

2 fields

EXAMPLE

Words Substance Of Response Example

2 fields

EXAMPLE

Words Syllables Example

2 fields

EXAMPLE

Words Syllables Response Example

3 fields

EXAMPLE

Words Synonyms Response Example

2 fields

EXAMPLE

Words Type Of Response Example

2 fields

EXAMPLE

Words Usage Of Response Example

2 fields

EXAMPLE

Words Word Entry Example

5 fields

EXAMPLE

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Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Words Authentication

apiKey · 1 scheme

SECURITY

Words Domain Security

TLSv1.3 · DNSSEC

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Words Agentic Access

30 operations

30 operations · 0 acting

AGENTIC

Use Cases 8

What developers build with this provider.

Dictionary and Thesaurus Applications

Power dictionary, thesaurus, and "word of the day" applications with definitions, synonyms, and related words.

Word Games and Puzzles

Drive crossword, Scrabble-style, and anagram games with filtered word search, rhymes, and difficulty-tunable random word selection.

Writing and Editing Tools

Build grammar, style, and writing assistants that suggest synonyms, antonyms, and frequency-aware alternatives.

Language Learning and Education

Provide IPA pronunciation, syllable splits, frequency, and example sentences for ESL and vocabulary-building apps.

NLP and Text Enrichment

Enrich downstream NLP pipelines with hypernyms, hyponyms, meronyms, and domain labels for entity expansion.

Voice and Speech Applications

Use IPA pronunciation and syllable data for speech synthesis, ASR vocabulary tuning, and pronunciation coaching.

Chatbots and Conversational Agents

Disambiguate user input by mapping words to their senses, hypernyms, and categories at runtime.

Content Generation and Rewriting

Drive paraphrasing and content-variation engines with synonym, similar-to, and pertains-to relationships.

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Integrations 3

Pre-built integrations with other platforms and tools.

RapidAPI

Words API is distributed, authenticated, and metered through the RapidAPI marketplace.

WordNet

Lexical relationships (typeOf, hasParts, memberOf, etc.) follow the WordNet relational model.

Subtitle Corpora

Frequency data is derived from large English movie and television subtitle corpora (see WordsAPI/wordfrequencies on GitHub).

Solutions 5

Packaged solutions this provider offers.

Free Tier

2,500 requests per day at no charge for prototyping, students, and small projects.

Pro

$10 / month, 25,000 requests per day for production applications and games.

Ultra

$49 / month, 250,000 requests per day for high-volume consumer applications.

Mega

$89 / month, 500,000 requests per day for very high-volume production workloads.

Data Purchase

One-time $629 purchase of the full Words API dataset for local hosting.

Resources

Get Started 1

Portal, sign-up, and the first successful call

Signup

Signup

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Design & Contract 3

Pagination, idempotency, versioning, errors, and events

SpectralRules

SpectralRules

Vocabulary

Vocabulary

JSONLD

JSONLD

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Word Frequencies Dataset

GitHubRepository

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

Contact

Contact

RateLimits

RateLimits

Commercial 3

Pricing, plans, and the legal terms of use

Pricing

Pricing

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 2

Properties that don't map to a standard resource type

RapidAPI Listing

Marketplace

PublicAPIsListing

PublicAPIsListing

Source (apis.yml)

aid: words
name: Words API
description: Words API is a RESTful English-language API that provides definitions, synonyms, antonyms, related words, syllables,
  pronunciation (IPA), rhymes, frequency, and hierarchical lexical relationships (typeOf, hasTypes, partOf, hasParts, memberOf,
  similarTo, also, entails, inCategory, inRegion, pertainsTo, etc.) for more than 150,000 English words. Distributed and metered
  through the RapidAPI marketplace.
url: https://www.wordsapi.com/docs/
baseURL: https://wordsapiv1.p.rapidapi.com
accessModel:
  pricing: paid
  onboarding: self-serve
  trial: false
  try_now: false
  public: false
  label: Paid · Self-serve signup
  confidence: high
  source:
  - plans
  - authentication
  generated: '2026-07-22'
  method: derived
image: https://www.wordsapi.com/img/logo.png
specificationVersion: '0.20'
created: '2026-05-28'
modified: '2026-05-30'
x-source: public-apis/public-apis
x-category: Dictionaries
x-tier: 3
x-tier-reason: bulk-registered-from-public-apis
tags:
- Dictionaries
- Linguistics
- English
- Thesaurus
- Lexical Data
- Public APIs
apis:
- aid: words:words-categories-api
  name: Words API Categories API
  description: Words API Category, Region, and Domain-Usage Relationships.
  humanURL: https://www.wordsapi.com/docs/
  baseURL: https://wordsapiv1.p.rapidapi.com
  tags:
  - Categories
  properties:
  - type: OpenAPI
    url: openapi/words-categories-api-openapi.yml
  - type: Documentation
    url: https://www.wordsapi.com/docs/
  - type: APIReference
    url: https://www.wordsapi.com/docs/#endpoints
  - type: Authentication
    url: https://www.wordsapi.com/docs/#authorization
  - type: Signup
    url: https://rapidapi.com/dpventures/api/wordsapi
  - type: JSONSchema
    url: json-schema/words-word-entry-schema.json
  - type: JSONSchema
    url: json-schema/words-result-schema.json
  - type: JSONSchema
    url: json-schema/words-definitions-response-schema.json
  - type: JSONSchema
    url: json-schema/words-synonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-antonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-examples-response-schema.json
  - type: JSONSchema
    url: json-schema/words-rhymes-response-schema.json
  - type: JSONSchema
    url: json-schema/words-frequency-response-schema.json
  - type: JSONSchema
    url: json-schema/words-syllables-response-schema.json
  - type: JSONSchema
    url: json-schema/words-pronunciation-response-schema.json
  - type: JSONSchema
    url: json-schema/words-search-response-schema.json
  - type: JSONStructure
    url: json-structure/words-word-entry-structure.json
  - type: JSONStructure
    url: json-structure/words-result-structure.json
  - type: Examples
    url: examples/words-word-entry-example.json
  - type: Examples
    url: examples/words-definitions-response-example.json
  - type: Examples
    url: examples/words-synonyms-response-example.json
  - type: Examples
    url: examples/words-frequency-response-example.json
  - type: Examples
    url: examples/words-search-response-example.json
- aid: words:words-definitions-api
  name: Words API Definitions API
  description: Words API Sense-level Definitions Grouped by Part of Speech.
  humanURL: https://www.wordsapi.com/docs/
  baseURL: https://wordsapiv1.p.rapidapi.com
  tags:
  - Definitions
  properties:
  - type: OpenAPI
    url: openapi/words-definitions-api-openapi.yml
  - type: Documentation
    url: https://www.wordsapi.com/docs/
  - type: APIReference
    url: https://www.wordsapi.com/docs/#endpoints
  - type: Authentication
    url: https://www.wordsapi.com/docs/#authorization
  - type: Signup
    url: https://rapidapi.com/dpventures/api/wordsapi
  - type: JSONSchema
    url: json-schema/words-word-entry-schema.json
  - type: JSONSchema
    url: json-schema/words-result-schema.json
  - type: JSONSchema
    url: json-schema/words-definitions-response-schema.json
  - type: JSONSchema
    url: json-schema/words-synonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-antonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-examples-response-schema.json
  - type: JSONSchema
    url: json-schema/words-rhymes-response-schema.json
  - type: JSONSchema
    url: json-schema/words-frequency-response-schema.json
  - type: JSONSchema
    url: json-schema/words-syllables-response-schema.json
  - type: JSONSchema
    url: json-schema/words-pronunciation-response-schema.json
  - type: JSONSchema
    url: json-schema/words-search-response-schema.json
  - type: JSONStructure
    url: json-structure/words-word-entry-structure.json
  - type: JSONStructure
    url: json-structure/words-result-structure.json
  - type: Examples
    url: examples/words-word-entry-example.json
  - type: Examples
    url: examples/words-definitions-response-example.json
  - type: Examples
    url: examples/words-synonyms-response-example.json
  - type: Examples
    url: examples/words-frequency-response-example.json
  - type: Examples
    url: examples/words-search-response-example.json
- aid: words:words-examples-api
  name: Words API Examples API
  description: Words API Real-world Example Sentences for Each Sense.
  humanURL: https://www.wordsapi.com/docs/
  baseURL: https://wordsapiv1.p.rapidapi.com
  tags:
  - Examples
  properties:
  - type: OpenAPI
    url: openapi/words-examples-api-openapi.yml
  - type: Documentation
    url: https://www.wordsapi.com/docs/
  - type: APIReference
    url: https://www.wordsapi.com/docs/#endpoints
  - type: Authentication
    url: https://www.wordsapi.com/docs/#authorization
  - type: Signup
    url: https://rapidapi.com/dpventures/api/wordsapi
  - type: JSONSchema
    url: json-schema/words-word-entry-schema.json
  - type: JSONSchema
    url: json-schema/words-result-schema.json
  - type: JSONSchema
    url: json-schema/words-definitions-response-schema.json
  - type: JSONSchema
    url: json-schema/words-synonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-antonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-examples-response-schema.json
  - type: JSONSchema
    url: json-schema/words-rhymes-response-schema.json
  - type: JSONSchema
    url: json-schema/words-frequency-response-schema.json
  - type: JSONSchema
    url: json-schema/words-syllables-response-schema.json
  - type: JSONSchema
    url: json-schema/words-pronunciation-response-schema.json
  - type: JSONSchema
    url: json-schema/words-search-response-schema.json
  - type: JSONStructure
    url: json-structure/words-word-entry-structure.json
  - type: JSONStructure
    url: json-structure/words-result-structure.json
  - type: Examples
    url: examples/words-word-entry-example.json
  - type: Examples
    url: examples/words-definitions-response-example.json
  - type: Examples
    url: examples/words-synonyms-response-example.json
  - type: Examples
    url: examples/words-frequency-response-example.json
  - type: Examples
    url: examples/words-search-response-example.json
- aid: words:words-frequency-api
  name: Words API Frequency API
  description: Words API Corpus-derived Frequency Statistics (Zipf, perMillion, diversity).
  humanURL: https://www.wordsapi.com/docs/
  baseURL: https://wordsapiv1.p.rapidapi.com
  tags:
  - Frequency
  properties:
  - type: OpenAPI
    url: openapi/words-frequency-api-openapi.yml
  - type: Documentation
    url: https://www.wordsapi.com/docs/
  - type: APIReference
    url: https://www.wordsapi.com/docs/#endpoints
  - type: Authentication
    url: https://www.wordsapi.com/docs/#authorization
  - type: Signup
    url: https://rapidapi.com/dpventures/api/wordsapi
  - type: JSONSchema
    url: json-schema/words-word-entry-schema.json
  - type: JSONSchema
    url: json-schema/words-result-schema.json
  - type: JSONSchema
    url: json-schema/words-definitions-response-schema.json
  - type: JSONSchema
    url: json-schema/words-synonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-antonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-examples-response-schema.json
  - type: JSONSchema
    url: json-schema/words-rhymes-response-schema.json
  - type: JSONSchema
    url: json-schema/words-frequency-response-schema.json
  - type: JSONSchema
    url: json-schema/words-syllables-response-schema.json
  - type: JSONSchema
    url: json-schema/words-pronunciation-response-schema.json
  - type: JSONSchema
    url: json-schema/words-search-response-schema.json
  - type: JSONStructure
    url: json-structure/words-word-entry-structure.json
  - type: JSONStructure
    url: json-structure/words-result-structure.json
  - type: Examples
    url: examples/words-word-entry-example.json
  - type: Examples
    url: examples/words-definitions-response-example.json
  - type: Examples
    url: examples/words-synonyms-response-example.json
  - type: Examples
    url: examples/words-frequency-response-example.json
  - type: Examples
    url: examples/words-search-response-example.json
- aid: words:words-hierarchy-api
  name: Words API Hierarchy API
  description: Words API Lexical Hierarchies — typeOf, hasTypes, partOf, hasParts, instances.
  humanURL: https://www.wordsapi.com/docs/
  baseURL: https://wordsapiv1.p.rapidapi.com
  tags:
  - Hierarchy
  properties:
  - type: OpenAPI
    url: openapi/words-hierarchy-api-openapi.yml
  - type: Documentation
    url: https://www.wordsapi.com/docs/
  - type: APIReference
    url: https://www.wordsapi.com/docs/#endpoints
  - type: Authentication
    url: https://www.wordsapi.com/docs/#authorization
  - type: Signup
    url: https://rapidapi.com/dpventures/api/wordsapi
  - type: JSONSchema
    url: json-schema/words-word-entry-schema.json
  - type: JSONSchema
    url: json-schema/words-result-schema.json
  - type: JSONSchema
    url: json-schema/words-definitions-response-schema.json
  - type: JSONSchema
    url: json-schema/words-synonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-antonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-examples-response-schema.json
  - type: JSONSchema
    url: json-schema/words-rhymes-response-schema.json
  - type: JSONSchema
    url: json-schema/words-frequency-response-schema.json
  - type: JSONSchema
    url: json-schema/words-syllables-response-schema.json
  - type: JSONSchema
    url: json-schema/words-pronunciation-response-schema.json
  - type: JSONSchema
    url: json-schema/words-search-response-schema.json
  - type: JSONStructure
    url: json-structure/words-word-entry-structure.json
  - type: JSONStructure
    url: json-structure/words-result-structure.json
  - type: Examples
    url: examples/words-word-entry-example.json
  - type: Examples
    url: examples/words-definitions-response-example.json
  - type: Examples
    url: examples/words-synonyms-response-example.json
  - type: Examples
    url: examples/words-frequency-response-example.json
  - type: Examples
    url: examples/words-search-response-example.json
- aid: words:words-phonetics-api
  name: Words API Phonetics API
  description: Words API Pronunciation (IPA), Syllables, and Rhymes.
  humanURL: https://www.wordsapi.com/docs/
  baseURL: https://wordsapiv1.p.rapidapi.com
  tags:
  - Phonetics
  properties:
  - type: OpenAPI
    url: openapi/words-phonetics-api-openapi.yml
  - type: Documentation
    url: https://www.wordsapi.com/docs/
  - type: APIReference
    url: https://www.wordsapi.com/docs/#endpoints
  - type: Authentication
    url: https://www.wordsapi.com/docs/#authorization
  - type: Signup
    url: https://rapidapi.com/dpventures/api/wordsapi
  - type: JSONSchema
    url: json-schema/words-word-entry-schema.json
  - type: JSONSchema
    url: json-schema/words-result-schema.json
  - type: JSONSchema
    url: json-schema/words-definitions-response-schema.json
  - type: JSONSchema
    url: json-schema/words-synonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-antonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-examples-response-schema.json
  - type: JSONSchema
    url: json-schema/words-rhymes-response-schema.json
  - type: JSONSchema
    url: json-schema/words-frequency-response-schema.json
  - type: JSONSchema
    url: json-schema/words-syllables-response-schema.json
  - type: JSONSchema
    url: json-schema/words-pronunciation-response-schema.json
  - type: JSONSchema
    url: json-schema/words-search-response-schema.json
  - type: JSONStructure
    url: json-structure/words-word-entry-structure.json
  - type: JSONStructure
    url: json-structure/words-result-structure.json
  - type: Examples
    url: examples/words-word-entry-example.json
  - type: Examples
    url: examples/words-definitions-response-example.json
  - type: Examples
    url: examples/words-synonyms-response-example.json
  - type: Examples
    url: examples/words-frequency-response-example.json
  - type: Examples
    url: examples/words-search-response-example.json
- aid: words:words-search-api
  name: Words API Search API
  description: Words API Search and Random Word Discovery Endpoint.
  humanURL: https://www.wordsapi.com/docs/
  baseURL: https://wordsapiv1.p.rapidapi.com
  tags:
  - Search
  properties:
  - type: OpenAPI
    url: openapi/words-search-api-openapi.yml
  - type: Documentation
    url: https://www.wordsapi.com/docs/
  - type: APIReference
    url: https://www.wordsapi.com/docs/#endpoints
  - type: Authentication
    url: https://www.wordsapi.com/docs/#authorization
  - type: Signup
    url: https://rapidapi.com/dpventures/api/wordsapi
  - type: JSONSchema
    url: json-schema/words-word-entry-schema.json
  - type: JSONSchema
    url: json-schema/words-result-schema.json
  - type: JSONSchema
    url: json-schema/words-definitions-response-schema.json
  - type: JSONSchema
    url: json-schema/words-synonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-antonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-examples-response-schema.json
  - type: JSONSchema
    url: json-schema/words-rhymes-response-schema.json
  - type: JSONSchema
    url: json-schema/words-frequency-response-schema.json
  - type: JSONSchema
    url: json-schema/words-syllables-response-schema.json
  - type: JSONSchema
    url: json-schema/words-pronunciation-response-schema.json
  - type: JSONSchema
    url: json-schema/words-search-response-schema.json
  - type: JSONStructure
    url: json-structure/words-word-entry-structure.json
  - type: JSONStructure
    url: json-structure/words-result-structure.json
  - type: Examples
    url: examples/words-word-entry-example.json
  - type: Examples
    url: examples/words-definitions-response-example.json
  - type: Examples
    url: examples/words-synonyms-response-example.json
  - type: Examples
    url: examples/words-frequency-response-example.json
  - type: Examples
    url: examples/words-search-response-example.json
- aid: words:words-thesaurus-api
  name: Words API Thesaurus API
  description: Words API Synonyms, Antonyms, and Similar Word Relationships.
  humanURL: https://www.wordsapi.com/docs/
  baseURL: https://wordsapiv1.p.rapidapi.com
  tags:
  - Thesaurus
  properties:
  - type: OpenAPI
    url: openapi/words-thesaurus-api-openapi.yml
  - type: Documentation
    url: https://www.wordsapi.com/docs/
  - type: APIReference
    url: https://www.wordsapi.com/docs/#endpoints
  - type: Authentication
    url: https://www.wordsapi.com/docs/#authorization
  - type: Signup
    url: https://rapidapi.com/dpventures/api/wordsapi
  - type: JSONSchema
    url: json-schema/words-word-entry-schema.json
  - type: JSONSchema
    url: json-schema/words-result-schema.json
  - type: JSONSchema
    url: json-schema/words-definitions-response-schema.json
  - type: JSONSchema
    url: json-schema/words-synonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-antonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-examples-response-schema.json
  - type: JSONSchema
    url: json-schema/words-rhymes-response-schema.json
  - type: JSONSchema
    url: json-schema/words-frequency-response-schema.json
  - type: JSONSchema
    url: json-schema/words-syllables-response-schema.json
  - type: JSONSchema
    url: json-schema/words-pronunciation-response-schema.json
  - type: JSONSchema
    url: json-schema/words-search-response-schema.json
  - type: JSONStructure
    url: json-structure/words-word-entry-structure.json
  - type: JSONStructure
    url: json-structure/words-result-structure.json
  - type: Examples
    url: examples/words-word-entry-example.json
  - type: Examples
    url: examples/words-definitions-response-example.json
  - type: Examples
    url: examples/words-synonyms-response-example.json
  - type: Examples
    url: examples/words-frequency-response-example.json
  - type: Examples
    url: examples/words-search-response-example.json
- aid: words:words-word-api
  name: Words API Word API
  description: Words API Lookup a Word and Retrieve Its Full Lexical Entry.
  humanURL: https://www.wordsapi.com/docs/
  baseURL: https://wordsapiv1.p.rapidapi.com
  tags:
  - Word
  properties:
  - type: OpenAPI
    url: openapi/words-word-api-openapi.yml
  - type: Documentation
    url: https://www.wordsapi.com/docs/
  - type: APIReference
    url: https://www.wordsapi.com/docs/#endpoints
  - type: Authentication
    url: https://www.wordsapi.com/docs/#authorization
  - type: Signup
    url: https://rapidapi.com/dpventures/api/wordsapi
  - type: JSONSchema
    url: json-schema/words-word-entry-schema.json
  - type: JSONSchema
    url: json-schema/words-result-schema.json
  - type: JSONSchema
    url: json-schema/words-definitions-response-schema.json
  - type: JSONSchema
    url: json-schema/words-synonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-antonyms-response-schema.json
  - type: JSONSchema
    url: json-schema/words-examples-response-schema.json
  - type: JSONSchema
    url: json-schema/words-rhymes-response-schema.json
  - type: JSONSchema
    url: json-schema/words-frequency-response-schema.json
  - type: JSONSchema
    url: json-schema/words-syllables-response-schema.json
  - type: JSONSchema
    url: json-schema/words-pronunciation-response-schema.json
  - type: JSONSchema
    url: json-schema/words-search-response-schema.json
  - type: JSONStructure
    url: json-structure/words-word-entry-structure.json
  - type: JSONStructure
    url: json-structure/words-result-structure.json
  - type: Examples
    url: examples/words-word-entry-example.json
  - type: Examples
    url: examples/words-definitions-response-example.json
  - type: Examples
    url: examples/words-synonyms-response-example.json
  - type: Examples
    url: examples/words-frequency-response-example.json
  - type: Examples
    url: examples/words-search-response-example.json
common:
- type: AgenticAccess
  url: agentic-access/words-agentic-access.yml
- type: DomainSecurity
  url: security/words-domain-security.yml
- type: Authentication
  url: authentication/words-authentication.yml
- type: Website
  url: https://www.wordsapi.com/
- type: Documentation
  url: https://www.wordsapi.com/docs/
- type: Signup
  url: https://rapidapi.com/dpventures/api/wordsapi
- type: Pricing
  url: https://rapidapi.com/dpventures/api/wordsapi/pricing
- type: Blog
  url: https://blog.wordsapi.com/
- type: Contact
  url: mailto:support@wordsapi.com
- type: GitHubOrganization
  url: https://github.com/WordsAPI
- type: GitHubRepository
  title: Word Frequencies Dataset
  url: https://github.com/WordsAPI/wordfrequencies
- type: Marketplace
  title: RapidAPI Listing
  url: https://rapidapi.com/dpventures/api/wordsapi
- type: PublicAPIsListing
  url: https://github.com/public-apis/public-apis
- type: Features
  data:
  - name: 150,000+ English Words
    description: Definitions, syllables, pronunciation, and lexical relationships across more than 150,000 English words.
  - name: Definitions and Parts of Speech
    description: Per-sense definitions grouped by part of speech (noun, verb, adjective, adverb).
  - name: Thesaurus (Synonyms and Antonyms)
    description: Interchangeable and opposite-meaning words for each sense of a word.
  - name: Lexical Hierarchies
    description: typeOf, hasTypes, partOf, hasParts, instanceOf, hasInstances, memberOf, hasMembers, substanceOf, hasSubstances,
      inCategory, hasCategories relationships.
  - name: Pronunciation in IPA
    description: International Phonetic Alphabet pronunciation, optionally split per part of speech.
  - name: Syllable Breakdown
    description: Syllable count and the ordered list of syllables for each word.
  - name: Rhymes
    description: Lists of rhyming words, distinguished by pronunciation variant where pronunciations differ.
  - name: Frequency Data
    description: Zipf frequency (1–7), per-million occurrence rate, and corpus diversity score derived from large English
      subtitle corpora.
  - name: Examples
    description: Sample sentences illustrating real usage for each sense.
  - name: Regional and Domain Usage
    description: inRegion, regionOf, inCategory, hasCategories, usageOf, hasUsages relationships connect words to dialects
      and subject domains.
  - name: Random and Filtered Word Search
    description: /words search endpoint supports letter count, letter pattern, phoneme count, IPA pattern, part of speech,
      and random selection.
- type: UseCases
  data:
  - name: Dictionary and Thesaurus Applications
    description: Power dictionary, thesaurus, and "word of the day" applications with definitions, synonyms, and related words.
  - name: Word Games and Puzzles
    description: Drive crossword, Scrabble-style, and anagram games with filtered word search, rhymes, and difficulty-tunable
      random word selection.
  - name: Writing and Editing Tools
    description: Build grammar, style, and writing assistants that suggest synonyms, antonyms, and frequency-aware alternatives.
  - name: Language Learning and Education
    description: Provide IPA pronunciation, syllable splits, frequency, and example sentences for ESL and vocabulary-building
      apps.
  - name: NLP and Text Enrichment
    description: Enrich downstream NLP pipelines with hypernyms, hyponyms, meronyms, and domain labels for entity expansion.
  - name: Voice and Speech Applications
    description: Use IPA pronunciation and syllable data for speech synthesis, ASR vocabulary tuning, and pronunciation coaching.
  - name: Chatbots and Conversational Agents
    description: Disambiguate user input by mapping words to their senses, hypernyms, and categories at runtime.
  - name: Content Generation and Rewriting
    description: Drive paraphrasing and content-variation engines with synonym, similar-to, and pertains-to relationships.
- type: Integrations
  data:
  - name: RapidAPI
    description: Words API is distributed, authenticated, and metered through the RapidAPI marketplace.
  - name: WordNet
    description: Lexical relationships (typeOf, hasParts, memberOf, etc.) follow the WordNet relational model.
  - name: Subtitle Corpora
    description: Frequency data is derived from large English movie and television subtitle corpora (see WordsAPI/wordfrequencies
      on GitHub).
- type: Solutions
  data:
  - name: Free Tier
    description: 2,500 requests per day at no charge for prototyping, students, and small projects.
  - name: Pro
    description: $10 / month, 25,000 requests per day for production applications and games.
  - name: Ultra
    description: $49 / month, 250,000 requests per day for high-volume consumer applications.
  - name: Mega
    description: $89 / month, 500,000 requests per day for very high-volume production workloads.
  - name: Data Purchase
    description: One-time $629 purchase of the full Words API dataset for local hosting.
- type: Plans
  url: plans/words-plans-pricing.yml
- type: RateLimits
  url: rate-limits/words-rate-limits.yml
- type: FinOps
  url: finops/words-finops.yml
- type: SpectralRules
  url: rules/words-rules.yml
- type: Vocabulary
  url: vocabulary/words-vocabulary.yml
- type: JSONLD
  url: json-ld/words-context.jsonld
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com