Home Providers Wordnik
Wordnik
Wordnik is the largest online English dictionary by number of words. Its v4 REST API exposes definitions from five dictionaries, etymologies, real example sentences from millions of sources, audio pronunciations, related-word relationships, frequency over time, hyphenation, bi-gram phrases, scrabble scores, random words, reverse-dictionary lookup, word-of-the-day, and authenticated user word lists.
Wordnik publishes 5 APIs on the APIs.io network, including Account API, Word API, Word List API, and 2 more. Tagged areas include Dictionaries, Dictionary, Word Data, English, and Lexicography.
The Wordnik catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.
Wordnik’s developer surface includes authentication, documentation, pricing, getting-started guide, signup flow, engineering blog, support, and 17 more developer resources.
1 APIs
On this page
Kin Score
APIs 5
Postman 5
Open Collections 7
Pricing Plans 1
Rate Limits 1
FinOps 1
Vocabularies 1
Spectral Rules 2
JSON Schema 37
JSON Structure 37
Examples 37
Security Posture 2
Agentic Access 1
Resources 24
apis.yml
50 Operational Transparency
0 Create-or-Update Ergonomics
Composite quality — 58.1/100 · strong
Agent readiness — 24/100 · agent aware
Individual APIs this provider publishes, each with its own machine-readable definition.
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Open, tool-agnostic API collections (OpenAPI-derived and Bruno).
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Published pricing tiers and plan structures.
Documented rate limits and quota policies.
Cost, billing, and metering signals for API financial operations.
JSON-LD contexts and semantic vocabularies used across these APIs.
Spectral governance rulesets for linting and validating these APIs.
Standalone JSON Schema definitions for this provider's data models.
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JSON Structure definitions describing this provider's data shapes.
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Example request and response payloads for these APIs.
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Authentication, domain security, vulnerability disclosure, and trust-center signals.
Recommended x-agentic-access execution contracts for AI agents.
Get Started 2
Portal, sign-up, and the first successful call
Documentation 1
Reference material describing how the API behaves
Agent Surfaces 1
MCP servers, agent skills, and machine-readable catalogs
Design & Contract 3
Pagination, idempotency, versioning, errors, and events
Build 2
SDKs, sample code, and the tooling you integrate with
Access & Security 2
Authentication, authorization, and security posture
Operate 3
Status, limits, changes, and where to get help
Commercial 4
Pricing, plans, and the legal terms of use
Company 2
The organization behind the API
Other 4
Properties that don't map to a standard resource type
Source (apis.yml)
aid: wordnik
name: Wordnik
description: Wordnik is the largest online English dictionary by number of words. Its v4 REST API exposes definitions from
five dictionaries, etymologies, real example sentences from millions of sources, audio pronunciations, related-word relationships,
frequency over time, hyphenation, bi-gram phrases, scrabble scores, random words, reverse-dictionary lookup, word-of-the-day,
and authenticated user word lists.
url: https://developer.wordnik.com
deliveryModel:
model: saas
open_source: false
commercial: true
callable_host: true
label: Hosted service · you call their endpoint
confidence: high
source:
- openapi
- pricing
generated: '2026-08-28'
method: derived
accessModel:
pricing: freemium
onboarding: self-serve
trial: true
try_now: true
public: false
label: Freemium (free trial) · Self-serve signup
confidence: high
source:
- plans
- authentication
generated: '2026-07-22'
method: derived
image: https://wordnik.com/img/logo-wordnik-home.png
specificationVersion: '0.23'
created: '2026-05-28'
modified: '2026-05-29'
x-source: public-apis/public-apis
x-category: Dictionaries
x-tier: 2
x-tier-reason: enriched-from-bulk-public-apis-with-full-openapi-and-capability-pipeline
tags:
- Dictionaries
- Dictionary
- Word Data
- English
- Lexicography
- Public APIs
apis:
- aid: wordnik:wordnik-account-api
name: Wordnik Account API
description: API-key status and user authentication operations.
humanURL: https://developer.wordnik.com
baseURL: https://api.wordnik.com/v4
tags:
- Account
properties:
- type: OpenAPI
url: openapi/wordnik-account-api-openapi.yml
- type: Documentation
url: https://developer.wordnik.com/docs
- type: GettingStarted
url: https://developer.wordnik.com/gettingstarted
- type: SDKs
url: https://pypi.org/project/wordnik-py3/
- type: SDKs
url: https://pypi.org/project/wordnik/
- type: SDKs
url: https://rubygems.org/gems/wordnik
- type: SDKs
url: https://github.com/wordnik/wordnik-php
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/java
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/kotlin
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/scala
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/android-java
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/objc
- aid: wordnik:wordnik-word-api
name: Wordnik Word API
description: Operations on a single English word (definitions, etymologies, examples, pronunciations, related words, frequency,
hyphenation, phrases, scrabble score, audio).
humanURL: https://developer.wordnik.com
baseURL: https://api.wordnik.com/v4
tags:
- Word
properties:
- type: OpenAPI
url: openapi/wordnik-word-api-openapi.yml
- type: Documentation
url: https://developer.wordnik.com/docs
- type: GettingStarted
url: https://developer.wordnik.com/gettingstarted
- type: SDKs
url: https://pypi.org/project/wordnik-py3/
- type: SDKs
url: https://pypi.org/project/wordnik/
- type: SDKs
url: https://rubygems.org/gems/wordnik
- type: SDKs
url: https://github.com/wordnik/wordnik-php
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/java
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/kotlin
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/scala
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/android-java
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/objc
- aid: wordnik:wordnik-word-list-api
name: Wordnik Word List API
description: Read and write operations on an individual user word list.
humanURL: https://developer.wordnik.com
baseURL: https://api.wordnik.com/v4
tags:
- Word List
properties:
- type: OpenAPI
url: openapi/wordnik-word-list-api-openapi.yml
- type: Documentation
url: https://developer.wordnik.com/docs
- type: GettingStarted
url: https://developer.wordnik.com/gettingstarted
- type: SDKs
url: https://pypi.org/project/wordnik-py3/
- type: SDKs
url: https://pypi.org/project/wordnik/
- type: SDKs
url: https://rubygems.org/gems/wordnik
- type: SDKs
url: https://github.com/wordnik/wordnik-php
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/java
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/kotlin
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/scala
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/android-java
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/objc
- aid: wordnik:wordnik-word-lists-api
name: Wordnik Word Lists API
description: Create new user word lists.
humanURL: https://developer.wordnik.com
baseURL: https://api.wordnik.com/v4
tags:
- Word Lists
properties:
- type: OpenAPI
url: openapi/wordnik-word-lists-api-openapi.yml
- type: Documentation
url: https://developer.wordnik.com/docs
- type: GettingStarted
url: https://developer.wordnik.com/gettingstarted
- type: SDKs
url: https://pypi.org/project/wordnik-py3/
- type: SDKs
url: https://pypi.org/project/wordnik/
- type: SDKs
url: https://rubygems.org/gems/wordnik
- type: SDKs
url: https://github.com/wordnik/wordnik-php
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/java
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/kotlin
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/scala
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/android-java
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/objc
- aid: wordnik:wordnik-words-api
name: Wordnik Words API
description: Cross-word operations (random words, reverse-dictionary search, full-text search, word-of-the-day).
humanURL: https://developer.wordnik.com
baseURL: https://api.wordnik.com/v4
tags:
- Word
tags_raw:
- Words
properties:
- type: OpenAPI
url: openapi/wordnik-words-api-openapi.yml
- type: Documentation
url: https://developer.wordnik.com/docs
- type: GettingStarted
url: https://developer.wordnik.com/gettingstarted
- type: SDKs
url: https://pypi.org/project/wordnik-py3/
- type: SDKs
url: https://pypi.org/project/wordnik/
- type: SDKs
url: https://rubygems.org/gems/wordnik
- type: SDKs
url: https://github.com/wordnik/wordnik-php
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/java
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/kotlin
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/scala
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/android-java
- type: SDKs
url: https://github.com/wordnik/wordnik-clients/tree/master/objc
common:
- type: PostmanWorkspace
url: https://www.postman.com/kinlaneapi/wordnik/overview
- type: AgenticAccess
url: agentic-access/wordnik-agentic-access.yml
- type: DomainSecurity
url: security/wordnik-domain-security.yml
- type: Authentication
url: authentication/wordnik-authentication.yml
- type: Website
url: https://wordnik.com
- type: Documentation
url: https://developer.wordnik.com
- type: Pricing
url: https://developer.wordnik.com/pricing
- type: GettingStarted
url: https://developer.wordnik.com/gettingstarted
- type: Signup
url: https://www.wordnik.com/signup
- type: Blog
url: https://blog.wordnik.com
- type: StatusPage
url: https://github.com/wordnik/wordnik-status
- type: GitHubOrganization
url: https://github.com/wordnik
- type: Support
url: mailto:apiteam@wordnik.com
- type: TermsOfService
url: https://www.wordnik.com/about
- type: Plans
url: plans/wordnik-plans-pricing.yml
- type: RateLimits
url: rate-limits/wordnik-rate-limits.yml
- type: FinOps
url: finops/wordnik-finops.yml
- type: Vocabulary
url: vocabulary/wordnik-vocabulary.yml
- type: SpectralRuleset
url: rules/wordnik-rules.yml
- type: JSONLDContext
url: json-ld/wordnik-context.jsonld
- type: OpenSource
title: Wordnik Public Word List
url: https://github.com/wordnik/wordlist
- type: OpenSource
title: NYT First Said
url: https://github.com/wordnik/nyt-first-said
- type: OpenSource
title: Language Museums Dataset
url: https://github.com/wordnik/language-museums
- type: PublicAPIsListing
url: https://github.com/public-apis/public-apis
features:
- name: Five Dictionary Sources
description: Definitions are drawn from American Heritage (ahd-5), Wiktionary, Webster, Century, and WordNet — selectable
per request via sourceDictionaries.
- name: Real-World Example Sentences
description: Examples come from millions of sources rather than constructed example text, with citation metadata via /word.json/{word}/examples
and /topExample.
- name: Audio Pronunciations
description: AHD mp3 audio pronunciations exposed via /word.json/{word}/audio with time-expiring fileUrls.
- name: Word Graph Relationships
description: Synonym, antonym, hypernym, hyponym, rhyme, and 17 other relationship types via /word.json/{word}/relatedWords.
- name: Frequency Over Time
description: Annual usage counts from 1800 onward via /word.json/{word}/frequency for historical / linguistic research.
- name: Reverse Dictionary
description: Natural-language query to candidate words via /words.json/reverseDictionary.
- name: Word Of The Day
description: Curated daily word with definitions, examples, and editorial notes via /words.json/wordOfTheDay.
- name: User Word Lists
description: Authenticated users can create, edit, and curate named word lists via /wordList.json and /wordLists.json.
useCases:
- name: Dictionary App
description: Build a consumer-facing dictionary or thesaurus app using definitions, etymologies, pronunciations, and examples.
- name: Word Games
description: Power crossword, scrabble, hangman, and word-discovery games using random words, search, and scrabble scoring.
- name: Vocabulary Learning
description: Build a flashcard or vocabulary-coach app using user word lists, word of the day, and definitions across grade
levels.
- name: Editorial Tooling
description: Surface synonyms, antonyms, and reverse-dictionary lookup inside CMS / writing tools.
- name: Linguistic Research
description: Use frequency-over-time data and the word-graph for academic linguistics and lexicographic research.
- name: Children's Education
description: Use the forthcoming children's / student definitions tier for age-appropriate vocabulary apps.
integrations:
- name: Python (wordnik-py3)
description: Official Python 3 client published to PyPI as `wordnik-py3`.
- name: Ruby (wordnik)
description: Official Ruby gem published to RubyGems as `wordnik`.
- name: PHP
description: Swagger-generated PHP client in wordnik/wordnik-php.
- name: Java
description: Swagger-generated Java client in wordnik/wordnik-clients/java.
- name: Kotlin / Scala / Android / Objective-C
description: Additional swagger-generated clients in wordnik/wordnik-clients.
solutions:
- name: Dictionary-Of-Record Integration
description: Use Wordnik as the canonical dictionary for a product surface, hitting /word.json/{word}/definitions with sourceDictionaries
selection logic.
- name: Quota-Aware Caching Layer
description: Cache results aggressively per-word and use /account.json/apiTokenStatus telemetry plus X-RateLimit headers
to right-size the Hobby / Pro / Enterprise tier.
maintainers:
- FN: Kin Lane
email: kin@apievangelist.com
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