A treasury of words is a rich and vast collection of words and phrases that are used to express various meanings and ideas. Synonyms for the term "treasury of words" include lexicon, vocabulary, repository, dictionary, glossary, wordbook, thesaurus, phrase book, and roget's thesaurus. A lexicon refers to a language or group of languages' vocabulary, while a vocabulary is a collection of words used by a person, team, or group of people. Repository is a place where objects or written works are stored or kept. dictionary, glossary, and word book refer to books that contain words and their definitions. A thesaurus is a book or application that lists words and their synonyms, while Roget's Thesaurus is a specific type of thesaurus.