High-fiber cereal is a type of breakfast cereal that is high in dietary fiber, which is beneficial for digestive health. Oatbran and BRAN are two examples of high-fiber cereals. Oatbran is a seven-letter word and BRAN is a four-letter word. Oatbran is made from oat groats, which are the hulled grains of oats, while BRAN is the hard outer layer of wheat and other grains. Both oatbran and BRAN are high in dietary fiber, making them excellent choices for a healthy breakfast.