Screenwriter
screen/playwright
A person who writes the libretto for an opera is simply referred to as the librettist.
A poetry
A playwright is a person who writes plays. A similar description is "dramatist."
A person who specializes in drama is typically referred to as a "dramaturg" or "drama specialist." They may also be called a "drama teacher" if they focus on education, or an "actor" if they perform in dramatic works. Additionally, someone who writes plays can be called a "playwright."
Playwright, dramatist.
The person who makes a will (or 'testament') is a testator.
A Philosopher
A person who writes the libretto for an opera is simply referred to as the librettist.
A drawer.
proposal
A poetry
publisher
A person who writes verses is a poet.
A columnist...?
The word is referee.
A screenwriter
Author