- firearm, piece, small-arm - a portable gun; "he wore his firearm in a shoulder holster"
--1 is a kind of gun
--1 has parts: firing pin; lock; sight
--1 has particulars:autoloader, self-loader; machine gun; muzzle loader; pistol, handgun, side arm, shooting iron; repeating firearm, repeater; rifle; riot gun; shotgun, scattergun; twenty-two, .22