Noun small-arm has 1 sense

• small-arm(n = noun.artifact) firearm, piece - a portable gun; "he wore his firearm in a shoulder holster"
has particulars: autoloader, self-loader, muzzle loader, handgun, pistol, shooting iron, side arm, repeater, repeating firearm, rifle, riot gun, scattergun, shotgun, smoothbore, .22, twenty-two
has parts: firing pin, lock, sights
is a kind of gun