Words API

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
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:
  - name: Words API
    description: >-
      RESTful English-language dictionary, thesaurus, and lexical-relationship API. One base resource — /words/{word} —
      plus 28 sub-resources for individual detail types (definitions, synonyms, antonyms, examples, rhymes, frequency,
      syllables, pronunciation, hasTypes, typeOf, partOf, hasParts, instances, instanceOf, similarTo, also, entails,
      memberOf, hasMembers, substanceOf, hasSubstances, inCategory, hasCategories, usageOf, hasUsages, inRegion,
      regionOf, pertainsTo) and a /words search/random endpoint with letter, sound, and part-of-speech filters.
    humanURL: https://www.wordsapi.com/docs/
    baseURL: https://wordsapiv1.p.rapidapi.com
    tags:
      - Dictionaries
      - Thesaurus
      - Linguistics
      - English
    properties:
      - 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: OpenAPI
        url: openapi/words-openapi.yml
      - type: JSONSchema
        title: WordEntry
        url: json-schema/words-word-entry-schema.json
      - type: JSONSchema
        title: Result
        url: json-schema/words-result-schema.json
      - type: JSONSchema
        title: DefinitionsResponse
        url: json-schema/words-definitions-response-schema.json
      - type: JSONSchema
        title: SynonymsResponse
        url: json-schema/words-synonyms-response-schema.json
      - type: JSONSchema
        title: AntonymsResponse
        url: json-schema/words-antonyms-response-schema.json
      - type: JSONSchema
        title: ExamplesResponse
        url: json-schema/words-examples-response-schema.json
      - type: JSONSchema
        title: RhymesResponse
        url: json-schema/words-rhymes-response-schema.json
      - type: JSONSchema
        title: FrequencyResponse
        url: json-schema/words-frequency-response-schema.json
      - type: JSONSchema
        title: SyllablesResponse
        url: json-schema/words-syllables-response-schema.json
      - type: JSONSchema
        title: PronunciationResponse
        url: json-schema/words-pronunciation-response-schema.json
      - type: JSONSchema
        title: SearchResponse
        url: json-schema/words-search-response-schema.json
      - type: JSONStructure
        title: WordEntry
        url: json-structure/words-word-entry-structure.json
      - type: JSONStructure
        title: Result
        url: json-structure/words-result-structure.json
      - type: Example
        title: WordEntry Example
        url: examples/words-word-entry-example.json
      - type: Example
        title: DefinitionsResponse Example
        url: examples/words-definitions-response-example.json
      - type: Example
        title: SynonymsResponse Example
        url: examples/words-synonyms-response-example.json
      - type: Example
        title: FrequencyResponse Example
        url: examples/words-frequency-response-example.json
      - type: Example
        title: SearchResponse Example
        url: examples/words-search-response-example.json
common:
  - 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