Datamuse

aid: datamuse
name: Datamuse
description: 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.
url: https://www.datamuse.com/api/
accessModel:
  pricing: freemium
  onboarding: open
  trial: false
  try_now: true
  public: true
  label: Freemium · Open access
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
specificationVersion: '0.20'
created: '2026-05-28'
modified: '2026-05-29'
x-source: public-apis/public-apis
x-category: Open Source Projects
x-type: company
x-tier: 3
x-tier-reason: bulk-registered-from-public-apis
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/datamuse.png
tags:
- 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
apis:
- aid: datamuse:datamuse-suggestions-api
  name: Datamuse Suggestions API
  description: Autocomplete suggestions with spelling correction and semantic fallback.
  humanURL: https://www.datamuse.com/api/
  baseURL: https://api.datamuse.com
  tags:
  - Suggestions
  properties:
  - type: OpenAPI
    url: openapi/datamuse-suggestions-api-openapi.yml
  - type: Documentation
    url: https://www.datamuse.com/api/
  - type: APIReference
    url: https://www.datamuse.com/api/
  - type: JSONSchema
    url: json-schema/datamuse-word-schema.json
  - type: JSONSchema
    url: json-schema/datamuse-suggestion-schema.json
  - type: JSONStructure
    url: json-structure/datamuse-word-structure.json
  - type: JSONStructure
    url: json-structure/datamuse-suggestion-structure.json
  - type: JSONLD
    url: json-ld/datamuse-context.jsonld
  - type: Examples
    url: examples/datamuse-getwords-example.json
  - type: Examples
    url: examples/datamuse-getsuggestions-example.json
  - type: RateLimits
    url: rate-limits/datamuse-rate-limits.yml
  - type: Pricing
    url: plans/datamuse-plans-pricing.yml
- aid: datamuse:datamuse-words-api
  name: Datamuse Words API
  description: Word-finding queries combining semantic, phonetic, orthographic, and vocabulary constraints.
  humanURL: https://www.datamuse.com/api/
  baseURL: https://api.datamuse.com
  tags:
  - Words
  properties:
  - type: OpenAPI
    url: openapi/datamuse-words-api-openapi.yml
  - type: Documentation
    url: https://www.datamuse.com/api/
  - type: APIReference
    url: https://www.datamuse.com/api/
  - type: JSONSchema
    url: json-schema/datamuse-word-schema.json
  - type: JSONSchema
    url: json-schema/datamuse-suggestion-schema.json
  - type: JSONStructure
    url: json-structure/datamuse-word-structure.json
  - type: JSONStructure
    url: json-structure/datamuse-suggestion-structure.json
  - type: JSONLD
    url: json-ld/datamuse-context.jsonld
  - type: Examples
    url: examples/datamuse-getwords-example.json
  - type: Examples
    url: examples/datamuse-getsuggestions-example.json
  - type: RateLimits
    url: rate-limits/datamuse-rate-limits.yml
  - type: Pricing
    url: plans/datamuse-plans-pricing.yml
common:
- type: AgenticAccess
  url: agentic-access/datamuse-agentic-access.yml
- type: DomainSecurity
  url: security/datamuse-domain-security.yml
- type: Website
  url: https://www.datamuse.com/
- type: Documentation
  url: https://www.datamuse.com/api/
- type: APIReference
  url: https://www.datamuse.com/api/
- type: Pricing
  url: https://www.datamuse.com/api/
- type: TermsOfService
  url: https://www.datamuse.com/api/
- type: PrivacyPolicy
  url: https://www.datamuse.com/api/
- type: Support
  url: https://www.datamuse.com/api/
- type: SpectralRules
  url: rules/datamuse-rules.yml
- type: Vocabulary
  url: vocabulary/datamuse-vocabulary.yml
- type: Plans
  url: plans/datamuse-plans-pricing.yml
- type: RateLimits
  url: rate-limits/datamuse-rate-limits.yml
- type: FinOps
  url: finops/datamuse-finops.yml
- type: PublicAPIsListing
  url: https://github.com/public-apis/public-apis
- type: SDKs
  url: https://github.com/sjblair/Datamuse4J
- type: SDKs
  url: https://github.com/gmarmstrong/python-datamuse
- type: SDKs
  url: https://github.com/ansteh/datamuse
- type: SDKs
  url: https://github.com/ezefranca/datamuse-swift
- type: SDKs
  url: https://github.com/owenvoke/datamuse-php-api-wrapper
- type: SDKs
  url: https://github.com/kostaspt/go-datamuse
- type: SDKs
  url: https://github.com/slogemann1/datamuse-api-wrapper
- type: SDKs
  url: https://github.com/benhess02/DatamuseDotNet
- type: SDKs
  url: https://github.com/mosegontar/rubymuse
- type: Tools
  url: https://github.com/lacausecrypto/datamuse-mcp
- type: Tools
  url: https://github.com/pipeworx-io/mcp-datamuse
- type: Tools
  url: https://github.com/bhayanak/datamuse-mcp-server
- type: Tools
  url: https://github.com/pipeworx-io/mcp-words
- type: Tools
  url: https://github.com/Eyalm321/multilingual-dictionary-mcp
- type: Features
  data:
  - name: Means Like (ml)
    description: Reverse-dictionary semantic constraint finding words whose meaning matches an input string of any length.
  - name: Sounds Like (sl)
    description: Phonetic constraint returning words pronounced similarly to a given input using a text-to-phonemes algorithm.
  - name: Spelled Like (sp)
    description: Orthographic constraint with wildcard pattern matching (* for any chars, ? for a single char).
  - name: Predefined Relations (rel_*)
    description: Twelve lexical relations including synonyms, antonyms, hypernyms, hyponyms, holonyms, meronyms, triggers,
      frequent followers/predecessors, rhymes, near-rhymes, homophones, and consonant matches.
  - name: Context Ranking
    description: Topics, left-context (lc), and right-context (rc) parameters skew results toward a document theme or surrounding
      words.
  - name: Lexical Metadata (md)
    description: Optional metadata flags add definitions, parts of speech, syllable counts, pronunciations, and corpus frequency
      to each word.
  - name: Pronunciation Formats
    description: Default Arpabet pronunciations or IPA via the ipa flag, drawing on the CMU Pronouncing Dictionary.
  - name: Multilingual Vocabularies
    description: Default English (550k terms) and Spanish (500k terms) vocabularies; custom domain vocabularies available
      on request.
  - name: Autocomplete (/sug)
    description: Intelligent prefix suggestions with spelling correction and semantic fallback when exact matches are unavailable.
  - name: No API Key Required
    description: Free non-commercial use up to 100,000 requests per day without an account or API token; HTTPS and HTTP both
      supported.
  - name: Query Echo (qe)
    description: Prepends the result list with a record describing the query string, useful for one-shot word-metadata lookups.
- type: UseCases
  data:
  - name: Vocabulary Building Apps
    description: Power flashcards, quizzes, and language-learning apps with synonyms, antonyms, and related-word lookups.
  - name: Creative Writing Tools
    description: Drive rhyme finders, thesaurus add-ins, and reverse-dictionary lookups for poetry, songwriting, and copywriting.
  - name: Word Games and Puzzles
    description: Generate clues, fill patterns with sp wildcards, and validate word lists for crosswords, hangman, and word
      ladders.
  - name: Autocomplete and Type-Ahead
    description: Provide intelligent prefix suggestions with spelling correction in search bars and form fields.
  - name: Educational Software
    description: Add definitions, syllable counts, and pronunciations to reading apps, ESL tools, and accessibility software.
  - name: Search Query Expansion
    description: Expand a user's search terms with semantically related words to improve recall in document or product search.
  - name: NLP Pre-Processing
    description: Look up word relations, frequencies, and pronunciations as features for downstream NLP pipelines.
  - name: Brand and Product Naming
    description: Combine sounds-like, means-like, and spelled-like constraints to brainstorm brand, domain, or product names.
- type: Integrations
  data:
  - name: OneLook
    description: Datamuse's flagship word search engine indexing 10M+ words across 1000+ dictionaries; built on the same backend.
  - name: OneLook Thesaurus
    description: Reverse-dictionary and thesaurus product available on web, as a Google Docs add-on, and as an iOS/Mac app.
  - name: RhymeZone
    description: Rhyming dictionary and writing tool partnered with Merriam-Webster, available on web and mobile.
  - name: Rimar.io
    description: Spanish-language rhyming dictionary and thesaurus powered by Datamuse's Spanish vocabulary.
  - name: CivicSearch
    description: Local government meeting search engine covering 700+ jurisdictions across the US and Canada.
  - name: WordNet 3.0
    description: Princeton lexical database supplying synonyms, antonyms, hypernyms, hyponyms, holonyms, and meronyms.
  - name: CMU Pronouncing Dictionary
    description: Source for Arpabet pronunciations and the basis for phonetic constraints (sl, rel_rhy, rel_hom, rel_cns).
  - name: Google Books Ngrams
    description: Corpus underpinning frequency scores and the rel_jja, rel_jjb, rel_bga, rel_bgb statistical relations.
  - name: Wiktionary
    description: Source of definitions returned via the md=d metadata flag.
  - name: word2vec / Paraphrase Database
    description: Corpus and embedding sources contributing to means-like and trigger relations.
  - name: Obsidian Wordy Plugin
    description: Community plugin embedding Datamuse-powered thesaurus and reverse-dictionary directly into Obsidian.
  - name: Model Context Protocol Servers
    description: Multiple community MCP servers (lacausecrypto/datamuse-mcp, pipeworx-io/mcp-datamuse, bhayanak/datamuse-mcp-server)
      expose the API to LLM agents.
- type: Solutions
  data:
  - name: Free Non-Commercial Tier
    description: Up to 100,000 requests per day with no API key, no signup, suitable for prototypes, hobby projects, research,
      and non-commercial education.
  - name: Commercial Plan
    description: Custom contract for production traffic in customer-facing applications, higher quotas, custom vocabularies,
      and SLA — pricing on request.
  - name: Custom Vocabulary Hosting
    description: Domain-specific term lists (medical, legal, gaming, internal jargon) hosted on Datamuse infrastructure with
      all standard relations.
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com