

A thesaurus provides synonyms, or similar words, for a word.

A dictionary provides definitions as well as outlines how a word is used grammatically and provides examples of its use. The plural of thesaurus is thesauruses or thesauri. A thesaurus can be a book you can find in a library, a website (such as ), or a database stored in a word processor (such as the one you can find in Microsoft Word). A thesaurus is a book or program that lists synonyms and antonyms of words. A thesaurus (plural thesauri or thesauruses) or synonym dictionary is a reference work which arranges words by their meanings, sometimes as a hierarchy of broader and narrower terms, sometimes simply as lists of synonyms and antonyms. Using the thesaurus, you can look up synonyms (different words with the same meaning) and antonyms (words with the opposite meaning).
