What is the opposite of book?

The opposite of "book" can be "kindle" or "e-book" in the sense that they are electronic devices used to read digital content, as opposed to traditional physical books.

In a more general sense, the opposite of "book" could be "movie" or "film", as they are visual media that tell a story, while books use written text.

"Audiobook" is another option as the opposite of "book", since audiobooks are audio recordings of written works, providing an alternative way to experience a book's content.