OMNIBUS (noun) : a volume of reprinted works of a single author or of works related in interest or theme.
e.g. a book of supernatural stories by Roald Dahl. A complete content of each book is used. An omnibus contained several complete books by one author.

ANTHOLOGY (noun) : a book or other collection of selected writings by various writers usually in the same literary form, of the same period, or on the same subject. e.g. a book of poetry by various poets selected from several books by many poets.

COLLECTION (noun) : a book of selected writings from various books by an author of the same theme or various themes. e.g. a book of selected short stories from various books by the same
author.