Author, Illustrator, and... what?

G has been creating some amazing books for the last few months. Yesterday I decided to setup a template for him so that he can make his books a little neater. You can download my PDF template here. Looking at his latest creation, I realized he wrote "Written and Illustrated by G", but "decided words by M". Then I realized he always thought "Author" means the physical act of writing, not the creative writing. For this story he was creating this book with input from M so he wrote "decided words by M".