Your request was thesaurs which is probably a typo from thesaurus.
thesaurs -
Traditional English :: thesaurus
thesaurs - n. (pl. thesauri or thesauruses) 1 a a collection of concepts or words arranged according to sense. b US a book of synonyms and antonyms. 2 a dictionary or encyclopaedia. [L f. Gk thesauros treasure]