Source : Webster's Revised Unabridged Dictionary (1913)

Puncher \Punch"er\, n.
   One who, or that which, punches.

Source : WordNet®

puncher
     n 1: a hired hand who tends cattle and performs other duties on
          horseback [syn: {cowboy}, {cowpuncher}, {cowman}, {cattleman},
           {cowpoke}, {cowhand}, {cowherd}]
     2: someone who delivers punches
     3: a tool for making (usually circular) holes [syn: {punch}]