Nailer n. : One whose occupation is to make nails; a nail maker.

Nailer n. : One who fastens with, or drives, nails.

Example:
What's the difference between a Brad Nailer and a Finishing Nailer?

Taxonomy
nails, nailer, power nailer, Power Nailers, compressor, fasteners, air compressor, the user, trigger, Coil nails, piston, tools, cordless nailer, drive nails, magazine, air pressure, Stick, air hose.

Defination from the web:
nailer. ... A piston in the cylinder moves rapidly downward, driving the nail in front of it into the material at the tip of the nailer. ...