tapper

Noun

• a dancer who sounds out rhythms by using metal taps on the toes and heels of the shoes

• someone who wiretaps a telephone or telegraph wire

• a worker who uses a tap to cut screw threads

• a person who strikes a surface lightly and usually repeatedly
  • finger tappers irritated her
    

• a tavern keeper who taps kegs or casks

Related words

• Synonyms: 
  tap dancer , wiretapper , phone tapper , tapster