catapult [catapults](device for launching large objects) noun [UK: ˈkæ.tə.pʌlt] [US: ˈkæ.tə.ˌpəlt]
slingshot [slingshots](Y-shaped stick with an elastic sling between the arms used for shooting small projectiles, see also: sling) noun [UK: ˈslɪŋ.ʃɒt] [US: sˈlɪŋ.ˌʃɑːt]