From WordNet (r) 3.0 (2006):
gun
n 1: a weapon that discharges a missile at high velocity
(especially from a metal tube or barrel)
2: large but transportable armament [syn: artillery, heavy
weapon, gun, ordnance]
3: a person who shoots a gun (as regards their ability) [syn:
gunman, gun]
4: a professional killer who uses a gun [syn: gunman,
gunslinger, hired gun, gun, gun for hire,
triggerman, hit man, hitman, torpedo, shooter]
5: a hand-operated pump that resembles a revolver; forces grease
into parts of a machine [syn: grease-gun, gun]
6: a pedal that controls the throttle valve; "he stepped on the
gas" [syn: accelerator, accelerator pedal, gas pedal,
gas, throttle, gun]
7: the discharge of a firearm as signal or as a salute in
military ceremonies; "two runners started before the gun"; "a
twenty gun salute"
v 1: shoot with a gun