Small arm, also known as a firearm, refers to any handheld firearm intended for use in personal defense, hunting, sport, or military purposes. A synonym for small arm can be a gun, pistol, rifle, revolver, or handgun. Both pistol and revolver are types of handguns, and they differ in terms of how the bullets are fired. The term firearm encompasses a broader range of weapons, including shotguns and machine guns. A rifle, on the other hand, has a long barrel and is often used for hunting or military purposes. In summary, small arm is a generic term, and there are various types of firearms that fall under this category.