Source : Webster's Revised Unabridged Dictionary (1913)

Pecker \Peck"er\, n.
   1. One who, or that which, pecks; specif., a bird that pecks
      holes in trees; a woodpecker.

   2. An instrument for pecking; a pick. --Garth.

   {Flower pecker}. (Zo["o]l.) See under {Flower}.

Source : WordNet®

pecker
     n 1: obscene terms for penis [syn: {cock}, {prick}, {dick}, {shaft},
           {peter}, {tool}, {putz}]
     2: bird with strong claws and a stiff tail adapted for climbing
        and a hard chisel-like bill for boring into wood for
        insects [syn: {woodpecker}, {peckerwood}]
     3: horny projecting mouth of a bird [syn: {beak}, {bill}, {neb},
         {nib}]