An encyclopedia or encyclopaedia (British English) is a reference work or compendium providing summaries of knowledge either from all branches or from a particular field or discipline. ... Encyclopedia entries are longer and more detailed than those in most dictionaries.

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encyclopedia: a book or set of books giving information on many subjects or on many aspects of one subject and typically arranged alphabetically.

almanac: an annual calendar containing important dates and statistical information such as astronomical data and tide tables.

thesaurus: a book that lists words in groups of synonyms and related concepts.

Dictionary: a book or electronic resource that lists the words of a language (typically in alphabetical order) and gives their meaning, or gives the equivalent words in a different language, often also providing information about pronunciation, origin, and usage.

index: an alphabetical list of names, subjects, etc., with references to the places where they occur, typically found at the end of a book.