Nouns

(n)tapster, tappera tavern keeper who taps kegs or casks
(n)tappera person who strikes a surface lightly and usually repeatedly“finger tappers irritated her”
(n)tappera worker who uses a tap to cut screw threads
(n)tapper, wiretapper, phone tappersomeone who wiretaps a telephone or telegraph wire
(n)tap dancer, tappera dancer who sounds out rhythms by using metal taps on the toes and heels of the shoes