tapper

from The American Heritage® Dictionary of the English Language, 4th Edition

• n. One that taps.

from Wiktionary, Creative Commons Attribution/Share-Alike License

• n. One who taps
• n. A tap-dancer
• n. A phone tapper or wiretapper
• n. A tapster
• n. In early wireless telegraphs, a device used to shake loose the filings of a coherer.
• n. The lesser spotted woodpecker.

from the GNU version of the Collaborative International Dictionary of English

• n. The lesser spotted woodpecker (Dendrocopus minor); -- called also tapperer, tabberer, little wood pie, barred woodpecker, wood tapper, hickwall, and pump borer.

from The Century Dictionary and Cyclopedia

• n. A hammer for striking a bell or chime.
• n. A device for restoring a coherer to its normal resistance, after this has been affected by electric oscillations, by means of a series of slight mechanical shocks.
• n. One who or that which operates a screw-cutting tap for threading holes.
• n. One who taps or draws liquor; a tapster; specifically, an innkeeper.
• n. One who or that which taps or strikes.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• n. someone who wiretaps a telephone or telegraph wire
• n. a dancer who sounds out rhythms by using metal taps on the toes and heels of the shoes
• n. a tavern keeper who taps kegs or casks
• n. a person who strikes a surface lightly and usually repeatedly
• n. a worker who uses a tap to cut screw threads