A novel is a book that is a work of fiction. The people and events are invented. It can be funny, serious, and adventure, a fantasy, realistic historical fiction, or many more genres.
"Drama" is a type of entertainment. A play or a movie can be called "a drama." It's not a comedy, or a romance, or an adventure -- it's a realistic story showing people experiencing realistic emotions, usually in a tense situation.
We don't usually call a dramatic book a drama. We say it's a dramatic novel.
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