| airgun | (noun) a gun that propels a projectile by compressed air | Synonyms: air gun, air rifle |
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| blowgun | (noun) a tube through which darts can be shot by blowing | Synonyms: blow tube, blowpipe, blowtube |
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| flashgun | (noun) a lamp for providing momentary light to take a photograph | Synonyms: flash, flash bulb, flash lamp, flashbulb, photoflash |
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| gun | (noun) the discharge of a firearm as signal or as a salute in military ceremonies | - |
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| (noun) a weapon that discharges a missile at high velocity (especially from a metal tube or barrel) | - |
| (noun) large but transportable armament | Synonyms: artillery, heavy weapon, ordnance |
| (noun) a hand-operated pump that resembles a pistol; forces grease into parts of a machine | Synonyms: grease gun |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator, accelerator pedal, gas, gas pedal, throttle |
| (noun) a professional killer who uses a gun | Synonyms: gun for hire, gunman, gunslinger, hired gun, hit man, hitman, shooter, torpedo, triggerman |
| (noun) a person who shoots a gun (as regards their ability) | Synonyms: gunman |
| (verb) shoot with a gun | - |
| handgun | (noun) a firearm that is held and fired with one hand | Synonyms: pistol, shooting iron, side arm |
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| popgun | (noun) plaything consisting of a toy gun that makes a popping sound | - |
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| scattergun | (noun) firearm that is a double-barreled smoothbore shoulder weapon for firing shot at short ranges | Synonyms: shotgun |
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| shogun | (noun) a hereditary military dictator of Japan; the shoguns ruled Japan until the revolution of 1867-68 | - |
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| shotgun | (noun) firearm that is a double-barreled smoothbore shoulder weapon for firing shot at short ranges | Synonyms: scattergun |
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| staplegun | (noun) a hand-held machine for driving staples home | Synonyms: staple gun, tacker |
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