Roget's International Thesaurus (7th Edition, Revised and Updated) : Unlike alphabetical thesauruses, Roget's International Thesaurus works the same way your brain does. First, you figure out the general category: Are you looking for a word related to values and ideals? Measure and shape? Then, look up the keywords to find the exact entry you're seeking. Plus, thousands of cross-references throughout lead to other helpful categories. More than 325,000 words and phrases in 1,072 categories compose this new edition of Roget's, including the newest slang words and expressions. In addition, hundreds of supplemental word lists supply the names of things that have no synonyms (wines, weapons, animals, state mottoes, and more).