Screenwriter
screen/playwright
A person who writes the libretto for an opera is simply referred to as the librettist.
A poetry
A person who writes opera is called a librettist, as they create the text or script for the opera. The composer, on the other hand, is responsible for writing the music that accompanies the libretto. Together, the librettist and composer collaborate to bring the opera to life.
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."
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
publisher
A poetry
A person who writes verses is a poet.
A columnist...?
The word is referee.
Procedural Author
A screenwriter