librettist

noun librettist

• author — The author of a piece of writing is the person who wrote it.
• writer — a person engaged in writing books, articles, stories, etc., especially as an occupation or profession; an author or journalist.
• dramatist — a writer of dramas or dramatic poetry; playwright.
• scenarist — a writer of motion-picture or television scenarios.
• tragedian — an actor especially noted for performing tragic roles.