A book containing summarised information on all branches of knowledge

Solution (By Examveda Team)

One word substitute is Encyclopaedia.

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.
Anthology: a published collection of poems or other pieces of writing.
Encyclopaedia: a book or set of books giving information on many subjects or on many aspects of one subject and typically arranged alphabetically.
Directory: a book or website listing individuals or organizations alphabetically or thematically with details such as names, addresses, and telephone numbers.