Solutions By the book has 5 entries with similar clues

• 5-letter words
• mangaJapanese comic books and cartoon films with a science fiction or fantasy theme
• 7-letter words
• sittersThey might be booked for getaways
• 8-letter words
• addenduma theologian with ambition starts to underline much in book's supplement
• 14-letter words
• subject-matterThe ideas, information, or theme of a book, work of art, speech, etc.
• 39-letter words
• isbn-international-standard-book-numberA number assigned to a newly published book in keeping with an international book classification system