tapper (Noun) — A tavern keeper who taps kegs or casks.
tapper (Noun) — A person who strikes a surface lightly and usually repeatedly. ex. "finger tappers irritated her"
tapper (Noun) — A worker who uses a tap to cut screw threads.
tapper (Noun) — Someone who wiretaps a telephone or telegraph wire.
tapper (Noun) — A dancer who sounds out rhythms by using metal taps on the toes and heels of the shoes.