Carbohydrates are an important part of a healthy diet and are found in many foods. The suffix 'ose' is commonly used to denote a carbohydrate, and there are four common carbohydrates that end with this suffix: ose (3 letters), STARCH (6 letters), LACTOSE (7 letters), and glycogen (8 letters). STARCH is a complex carbohydrate found in grains, potatoes, and other vegetables. LACTOSE is a sugar found in milk and dairy products. Glycogen is a form of glucose stored in the liver and muscles.