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Definition of gun : 1. A piece of heavy ordnance; in a restricted sense, a cannon.
2. A weapon which throws or propels a missile to a distance; any firearm or instrument for throwing projectiles by the explosion of gunpowder, consisting of a tube or barrel closed at one end, in which the projectile is placed, with an explosive charge behind, which is ignited by various means. Muskets, rifles, carbines, and fowling pieces are smaller guns, for hand use, and are called small arms. Larger guns are called cannon, ordnance, fieldpieces, carronades, howitzers, etc. See these terms in the Vocabulary.
3. of Gin
4. To practice fowling or hunting small game; - chiefly in participial form; as, to go gunning.
5. Violent blasts of wind.

Synonyms:

poor boy, throttle valve, arm, gun for hire, gaseous state, grinder, 0.45, guns, flatulence, box in, petrol, Allen wrench, flatulency, numbfish, crampfish, wedge, crap-shooter, accelerator, blowlamp, speed up, gunslinger, plug, natural gas, sub, accelerate, heat, bellows, applicator, car-pool, gasolene, derringer, automatic, change down, shoot, box end wrench, stimulate, munition, block in, hitman, adjustable wrench, gas, bus, blowtorch, carve up, gunman, gasoline, help, small arm, catalyst, awl, taw, submarine sandwich, accelerator pedal, ordnance store, gas pedal, shot, heavy weapon, BB gun, zep, bypass, artillery unit, submarine, hero sandwich, air gun, buckle up, throttle, carry, triggerman, hit man, atom smasher, bit, air rifle, hoagy, bradawl, particle accelerator, hero, back up, hasten, hired gun, hoagie, grease-gun, electric ray

weapon (part of speech: noun)

Colt, bullet, ammunition, arrow, blowpipe, ax, trigger, Sidewinder, Remington, carbine, Browning, battery, shell, artillery, stiletto, piece, torpedo, peashooter, howitzer, sword, rifle, firearm, flamethrower, missile, dagger, knife, spear, shooter, heater, broadsword, blowgun, ordnance, bayonet, machine gun, rocket, musket, bilbo, handgun, machete, lance, weapon, bow and arrow, pistol, armament, revolver, blunderbuss, repeater, saber, cannon, club, mortar, luger, scimitar, mace, weaponry, bomber, muzzle, boomerang, Winchester, shotgun, rapier, claymore, cutlass, bazooka, javelin

Usage examples: