[1] : The Collaborative International Dictionary of English v.0.48

tapper \tap"per\, n. zool.
   the lesser spotted woodpecker dendrocopus minor; --
   called also tapperer, tabberer, little wood pie,
   barred woodpecker, wood tapper, hickwall, and pump
   borer. prov. eng.
   1913 webster
see also:
dendrocopus minor tapperer tabberer little wood pie barred woodpecker wood tapper 
hickwall pump borer 

[2] : WordNet (r) 2.0

tapper
     n 1: a tavern keeper who taps kegs or casks syn: tapster
     2: a person who strikes a surface lightly and usually
        repeatedly; "finger tappers irritated her"
     3: a worker who uses a tap to cut screw threads
     4: someone who wiretaps a telephone or telegraph wire syn: wiretapper,
         phone tapper
     5: a dancer who who sounds out rhythms by using metal taps on
        the toes and heels of the shoes syn: tap dancer
see also:
tapster wiretapper phone tapper tap dancer 

Tapper >> T Words
Tapper, definition of term: Tapper
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