proposal
A jingler
A person who writes letters for others is often referred to as a "letter writer" or "scribe." In some contexts, particularly historical or literary, they might also be called a "secretary." Additionally, if they are providing this service professionally, they might be known as a "professional letter writer" or "correspondence specialist."
you call the first person you wanted to call and then press flash and then called the second person and then press another flash and there you go , a three way call.
To the point
a polictian
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.
publisher
A poetry
A person who writes verses is a poet.
A columnist...?
The word is referee.
Procedural Author
A screenwriter
Columnist