Use the Big Huge Thesaurus API to get synonyms for words, as well as antonyms, related terms, and similar terms. This is a free, English language thesaurus with over 145,000 words. No API key required if you make fewer than 10,000 calls per day. Version 1 has simple output, and version 2 has enhanced output, including the part of speech and relationships to the submitted word.
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