thésaurus

A thesaurus is a reference work that contains synonyms and often antonyms of words. It is a popular tag because of their usefulness and free availability online.

Unlike dictionaries, a thesaurus does not contain definitions or pronunciations. Instead, if a person has a word in mind but it isn't quite right, they can look up the word in a thesaurus to find related or similar words.  Conversely, it can be used to find something that is the opposite of a particular word. 

The term is also used to describe a list of subject headings or descriptors assigned in a database, index, or catalog that can be used to search it. With either usage, there are both general and specialized versions.

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