Search for synonyms using the Visual Thesaurus The Visual Thesaurus is an online thesaurus and dictionary of over 145,000 words that you explore and visualize using an interactive map. Type in a word and the Visual Thesaurus will show you a map of synonyms, antonyms, and definitions. Unlike Roget's Thesaurus, the Visual Thesaurus contains over 39,000 proper nouns and American and British spellings