shooter

noun

• 1a person who uses a gun either regularly or on a particular occasion.
• informal a gun.

• 2a member of a team in games such as basketball whose role is to attempt to score goals.
• a person who throws a die or dice.

• 3a marble used to shoot at other marbles.

• 4 informal a small alcoholic drink, especially of distilled liquor:geez, he could use a shooter of whiskey