A wordbook is a reference book that lists words in alphabetical order and defines them. Synonyms for wordbooks include dictionaries, lexicons, glossaries, vocabularies, and thesauruses. Dictionaries are the most common type of wordbook, providing definitions, spellings, and pronunciation guides for words. Lexicons, on the other hand, may focus on a particular field, such as medical terms or computer terminology. Glossaries are typically used to define specialized terms and jargon, such as those used in legal or technical fields. Vocabularies often focus on language learning, providing lists of words and definitions in a foreign language. Finally, a thesaurus is a type of wordbook that groups words based on similarity in meaning rather than alphabetical order.