The terms "cinnamon buns" and "cinnamon rolls" are often used interchangeably, but there are slight differences in the two recipes. Cinnamon buns may sometimes include fillings like nuts or raisins, and usually have a sticky syrup topping, often baked on the bottom then inverted from the pan. Cinnamon rolls tend to have just a cinnamon-sugar filling and are topped with a thick sweet and creamy frosting.