There are basically 2 jobs in this area, Drywallers (installers, who only screw it up in place ) and Tapers ( who only tape, mud and sand ). Very few pros do both. ( although they all know how to, they have specialised in one or the other)
A drywaller or a finisher or taper.
drywall covers the insulation in your house its normally what walls are made of
what is the person who works in a coal mine called? A MINER!!!
A person who works in archives is called an archivist.
A person who works on a car is known as a mechanic.
A person who works to manage relations is called a negotiator.
Plastic sheeting works well for this, and yes it goes behind the drywall on exterior walls to help prevent moisture from getting to the drywall.
This person works as a gemologist.
A person who works with and finds dinosaur bones professionally is called a Paleontologist.
Guerrilla
co-worker.
porter
a librarian