A bun is a type of sweet bread that's often shaped into a ball or oblong. You can find buns at bakeries or cafes.
When people talk about a bun, they usually mean the food itself. But if you're in a hair salon, your stylist might refer to a "rat-tail bun" - a style of hairstyle where long hair is tied up and gathered into a knot on the back of the head. It's not the same as the bread!
A small bread roll, often sweetened or spiced.
