The term 'BURGER roll' is composed of two words: 'BUN' and 'BURGER'. The word 'BUN' is a three-letter word that refers to a small, round, flat bread roll. It is often used as the base for sandwiches, burgers, and hot dogs. The word 'BURGER' is a five-letter word that refers to a sandwich consisting of a patty of ground meat, usually beef, placed between two slices of bread or a BUN. Together, the two words form the term 'BURGER roll', which is a type of sandwich made with a hamburger patty, lettuce, tomato, onion, and condiments, all served on a BUN.