(n.) A treasury or storehouse; hence, a repository, especially of knowledge; -- often applied to a comprehensive work, like a dictionary or cyclopedia. Thesaurus is an English word that is used in ...

That's what a thesaurus is for. A thesaurus is set out in alphabetical order, like a dictionary, so you look up words in the same way. For example, if you wanted to find another word for ‘nice ...