Datamuse operates a word-finding query engine and lexical search service for developers, educators, and creative-writing applications. The Datamuse API exposes a /words endpoint that finds words matching a rich combination of semantic, phonetic, orthographic, and vocabulary constraints (means-like, sounds-like, spelled-like, synonyms, antonyms, hypernyms, meronyms, triggers, rhymes, homophones, and more) plus a /sug autocomplete endpoint. Free for non-commercial use up to 100,000 requests per day with no API key required; commercial use, custom vocabularies, and higher rate limits are available via a paid commercial agreement. Datamuse also runs OneLook, OneLook Thesaurus, RhymeZone, Rimar.io, and CivicSearch — consumer-facing word search tools built on the same lexical infrastructure.
APIs.json: https://www.datamuse.com/api/
- Word Finding
- Lexical Search
- Natural Language
- Vocabulary
- Synonyms
- Antonyms
- Rhymes
- Phonetics
- Semantic Search
- Reverse Dictionary
- Autocomplete
- Wordplay
- Creative Writing
- Vocabulary Apps
- Word Games
- Linguistics
- Open Source Projects
- Public APIs
- Created: 2026-05-28
- Modified: 2026-05-29
The Datamuse REST API exposes two operations covering word-finding (/words) and autocomplete suggestions (/sug). The /words endpoint accepts a rich combination of constraint parameters — semantic (ml, rel_syn, rel_ant, rel_trg, rel_spc, rel_gen, rel_com, rel_par, rel_jja, rel_jjb), phonetic (sl, rel_rhy, rel_nry, rel_hom, rel_cns), orthographic (sp with wildcards), and vocabulary (v=en|es) — plus ranking hints (topics, lc, rc) and result controls (max, md, qe, ipa). No authentication required for free non-commercial use up to 100k requests/day.
- Human URL: https://www.datamuse.com/api/
- Base URL:
https://api.datamuse.com
- Word Finding
- Lexical Search
- Natural Language
- Documentation
- API Reference
- OpenAPI — OpenAPI Specification
- Postman Collection — Postman Collection 2.1
- Open Collection — Open Collection 1.0
- JSON Schema — JSON Schema
- JSON Schema — JSON Schema
- JSON Structure
- JSON Structure
- J S O N- L D
- Example
- Example
- Rate Limits
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- Website
- Documentation
- API Reference
- Pricing
- Terms of Service
- Privacy Policy
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- Spectral Rules
- Vocabulary
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- Fin Ops
- Public APIs Listing
- SDK
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FN: Kin Lane Email: kin@apievangelist.com