typer
They are called postmen and postladies or posties for short.
Letter writer
Typyst
Post lady
a typist or a keyboardist
A secretary writes letters for a manager.
A secretary
guider
A Typist is a person that types. People that type for a living are also secretary.
A person who constantly writes letters of complaint can be referred to as a chronic complainer or a serial complainer.
idle
A 'spelunker'
A Ph.d is a doctorate. A person with the letters Ph.d after their name is called a Doctor, even if they did not study medicine.
a rapper
They are called reporters or editors
Versatile. Interesting.