WordsAPI
An API for the english language. Definitions, related words, rhymes, and more.
WordsAPI launched on January 5, 2015 with 263 votes, #27 of 1,772 launches that month and more than 99% of that year's launches. The site was still online in September 2026, 11 years on.
In plain words
WordsAPI is a RESTful API that provides access to the English language, including definitions for over 150,000 words, synonyms, antonyms, and related words. It is designed for developers building applications that need linguistic data. Users can query the API directly or purchase a local data set for offline use in games, applications, or machine learning projects.
written from the facts on this page · September 2026
From the sources
Find definitions, related words, and more, with a simple to use RESTful API. Use it to find definitions for more than 150,000 words. Try some: You can find synonyms, antonyms, or similar words. Try some: If you'd prefer to host the data locally, you can purchase the Words API data set . Purchase of the Words API data set entitles you to use the data as much as you want, for as long as you want. Load the data directly into your app, make games with it, train an AI to take over the world with it. The only things you cannot do with the data are resell it, or use it in a service that competes directly with WordsAPI. And we'd really prefer you didn't use it to train an AI to take over the world.…from wordsapi.com
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