Glossary : an alphabetical list of words relating to a specific subject, text, or dialect, with explanations; a brief dictionary. Reference : the action of mentioning or alluding to something. Index : (in a book or set of books) an alphabetical list of names, subjects, etc. with reference to the pages on which they are mentioned. Summary : a brief statement or account of the main points of something. Compendium : a collection of concise but detailed information about a particular subject, especially in a book or other publication.