Free Thesaurus is an unique web thesaurus of synonym words, antonyms, and related words. The thesaurus contains in excess of 145,800 one of a kind word sections from three top sources: Collins Thesaurus of the English Language - Complete and Unabridged, The American Heritage Roget's Thesaurus, and WordNet. Search words or expressions to discover synonyms, antonyms, and related words, all recognized by shading and assembled by importance. Filter by grammatical form to see just the related words you need to see. Rapidly discover the synonyms for a huge number of words with Free Thesaurus.