What do you call someone who writes books?

The most common word for someone who writes books is author.

Here are some other, less common words you could use:

* Writer: This is a broader term, as writers can write many things besides books (articles, scripts, poems, etc.).

* Novelist: Specifically for writers of novels.

* Scribbler: This is a somewhat informal and sometimes humorous term for a writer.

* Wordsmyth: A less common but more poetic term for a writer.

* Penman/Penwoman: An older term for a writer, often used in historical contexts.

* Storyteller: This emphasizes the narrative aspect of the writer's work.

* Bookworm: This is a playful term, often used to describe someone who loves to read, but it can sometimes be used to describe a writer as well.