The term BURP can refer to four different things. ERUCT is a five letter word meaning to expel gas from the stomach through the mouth, which is commonly known as burping. BELCH is also a five letter word meaning to emit gas from the stomach through the mouth, which is another way of saying burping. UZIS is a four letter word referring to a type of submachine GUN developed in Israel in the 1940s. Finally, GUN is a three letter word referring to a weapon that fires bullets or shells.