plumber

n.

A craftsman who installs and repairs pipes and fixtures and appliances.

Also called pipe fitter.

plunger

n.

A device consisting of a rubber suction cup attached to the end of a stick, used to unclog drains and pipes.

The intent of using a plunger is to loosen or break up a clog, excessive material, or other blockage in a sink, toilet, bathtub, shower, etc.

Also called plumber's helper.