Definitions of shooter:

• noun:   (sports) a player who drives or kicks a ball at the goal (or a basketball player who shoots at the basket)
• noun:   a gambler who throws dice in the game of craps
• noun:   a professional killer who uses a gun
• noun:   a large marble used for shooting in the game of marbles
• noun:   a person who shoots (usually with respect to their ability to shoot)

  Example: "A poor shooter"