Source : Webster's Revised Unabridged Dictionary (1913)

Scratcher \Scratch"er\, n.
   One who, or that which, scratches; specifically (Zo["o]l.),
   any rasorial bird.

Source : WordNet®

scratcher
     n 1: a workman who uses a tool for scratching
     2: a person who scratches to relieve an itch
     3: a device used for scratching