shooter

from The Century Dictionary.

• noun One who shoots: most commonly used in composition, as in the term sharp-shooter.
• noun [Formerly used attributively, in the sense of ‘useful for shooting, as for bows in archery.’
• noun An implement for shooting; a pistol or gun: usually compounded with some descriptive word, forming a compound term denoting the kind of weapon: as, a pea-shooter; a six-shooter (a revolver).
• noun A shooting-star.
• noun The guard of a coach.
• noun In cricket, a ball bowled which, owing to an inequality in the ground, bounds close to the surface after pitching.

from the GNU version of the Collaborative International Dictionary of English.

• noun One who shoots, as an archer or a gunner.
• noun Colloq. U.S., rare, Colloq. U.S., rare That which shoots.
• noun Colloq. U.S., rare, rare A firearm.
• noun rare A shooting star.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Someone who shoots something; a gunner, archer etc.
• noun slang A firearm.
• noun A videogame or arcade game in which shooting enemies (or targets) is the main objective.
• noun professional wrestling slang A professional wrestler who uses actual fighting moves as part of his style, or who speaks his mind during a live or televised event (instead of speaking from a script).
• noun A large marble used for knocking smaller marbles out of a chalk circle.
• noun An alcoholic beverage typically served in a shot glass.
• noun A shooting star.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

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