What's another word for "Thesaurus?"

Funny things can happen when you work at a school. Like today, when I heard a student ask, "What's another word for Thesaurus?" I'm not sure I've ever heard that question before.

I decided to check the source I know for that kind of question ... a thesaurus (obviously).

It's not that helpful, actually. But for the student looking for synonyms for thesaurus, here you go: glossary, language reference book, lexicon, onomasticon, reference book, sourcebook, storehouse of words, terminology, treasury of words, vocabulary, word list