Megabooks can be defined as a comprehensive collection of books that cater to a wide range of topics and interests. Diverse synonyms can be used to describe this massive collection of books, including colossal books, voluminous volumes, extensive library, massive tomes, and an extensive anthology of literature. Other relevant terms for megabooks include extensive reading materials, comprehensive textbook collection, expansive literature compilation, and broad reference materials. The use of these synonyms is essential for describing the vast collection of books that megabooks represents. Overall, the various synonyms for megabooks aptly capture the essence of a grand and extensive collection of books.