Pis forProjectile
Ris forRazor blade
Ris forRazor wire
Razor wire, or barbed tape is similar to barbed wire but is designed to stop humans rather than animals from passing. There is a single strand of barbed wire in the picture. Razor wire has sharp blades made from pressed stainless steel along its length. The blades are designed to give very bad cuts to anyone trying to climb over it.
A rifle is a type of weapon that is designed to be fired while supported by your shoulder, unlike small guns which are simply held in your hand. Rifles are most often used for hunting, or by the military. Older rifles could only fire one bullet at a time, some modern rifles fire in bursts, or can fire continuously.
A slingshot is a weapon made from a Y-shaped arm with an elastic band connecting the two arms. There is usually a pocket for a stone or other projectile in the centre of the band. Slingshots can be very accurate, and can be used to hunt small game.
Sparring is a term for a fight, usually one for training purposes. Sparring might also mean a fight as part of a competition, and can be used to talk about a non-physical contest, such as verbal sparring. Once a fight is fueled by emotion and gets out of control, it isn't sparring.