"tapper" in the noun sense
1. tapster, tapper
a tavern keeper who taps kegs or casks
2. tapper
a person who strikes a surface lightly and usually repeatedly
"finger tappers irritated her"
3. tapper
a worker who uses a tap to cut screw threads
4. tapper, wiretapper, phone tapper
someone who wiretaps a telephone or telegraph wire
5. tap dancer, tapper
a dancer who sounds out rhythms by using metal taps on the toes and heels of the shoes
Source: WordNet® (An amazing lexical database of English)
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