You're absolutely right, what was I thinking?!?
Here, allow me use a thesaurus to get the true meaning of thesaurus.
Entry: book
Function: noun
Definition: document
Synonyms: album, atlas, bestseller, bible, booklet, brochure, codex, compendium, copy, dictionary, dissertation, edition, encyclopedia, essay, fiction, folio, handbook, hardcover, leaflet, lexicon, magazine, manual, monograph, nonfiction, novel, octavo, offprint, omnibus, opus, opuscule, pamphlet, paperback, periodical, portfolio, preprint, primer, publication, quarto, reader, reprint, scroll, softcover, speller, text, textbook, thesaurus, tome, tract, treatise, volume, work, writing
Source: Roget's New Millennium™ Thesaurus, First Edition (v 1.0.5)
Copyright © 2004 by Lexico Publishing Group, LLC. All rights reserved.
Entry: lexicon
Function: noun
Definition: meanings
Synonyms: dictionary, glossary, terminology, thesaurus, vocabulary, word stock, wordbook, wordlist
Source: Roget's New Millennium™ Thesaurus, First Edition (v 1.0.5)
Copyright © 2004 by Lexico Publishing Group, LLC. All rights reserved.
Makes sense. A thesaurus is a thesaurus which is also a dictionary that is a thesaurus. In addition it is clearly a bible for one to worship, as in the case of Tadou.