thesaurus

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Definitions from WordNet

Noun thesaurus has 1 sense

thesaurus, synonym finder - a book containing a classified list of synonyms
--₁ is a kind of wordbook
--₁ has particulars: word finder, wordfinder

Definitions from the Web

Thesaurus

Definition:

A thesaurus is a reference book or online resource that provides synonyms and antonyms for words, helping writers and speakers expand their vocabulary and enhance their language skills.

Examples:

I was struggling to find the right words for my essay, so I turned to the thesaurus for some synonyms.
Using a thesaurus, I discovered a perfect antonym to convey the opposite meaning in my speech.