Source : Webster's Revised Unabridged Dictionary (1913)

Shooter \Shoot"er\, n.
   1. One who shoots, as an archer or a gunner.

   2. That which shoots. Specifically:
      (a) A firearm; as, a five-shooter. [Colloq. U.S.]
      (b) A shooting star. [R.]

Source : WordNet®

shooter
     n 1: a large marble used for shooting in the game of marbles
          [syn: {taw}]
     2: a person who shoots (usually with respect to their ability
        to shoot); "he is a crack shot"; "a poor shooter" [syn: {shot}]
     3: a gambler who throws dice in the game of craps [syn: {crap-shooter}]
     4: (sports) a player who drives or kicks a ball at the goal (or
        a basketball player who shoots at the basket)
     5: a professional killer who uses a gun [syn: {gunman}, {gunslinger},
         {hired gun}, {gun}, {gun for hire}, {triggerman}, {hit
        man}, {hitman}, {torpedo}]