Words API
wordsapi.com
A RESTful API that returns definitions, synonyms, antonyms, rhymes, pronunciations, word frequency, and hierarchical semantic relationships for over 150,000 English words.
The Words API API uses api key authentication; has freemium pricing; offers a free tier (Basic plan free, 2,500 requests per day); rate limits: Plan-based daily request limits (e.g. 2,500/day free, up to 500,000/day). Verified 2026-07-12 with per-field source links.
Pricing
Basic Free (2,500 req/day); Pro $10 (25,000 req/day); Ultra $49 (250,000 req/day); Mega $89 (500,000 req/day); Data set purchase $629
wordsapi.com ↗OpenAPI spec
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