Roadsters are a type of vehicle that have been around since the early 1900s. They are two-seater, open-top CARS that are designed for speed and agility. Runabouts, which are nine letters long, are a type of roadster that is typically smaller and lighter than other types of CARS. AUTOS, which are five letters long, are another type of roadster that is usually larger and more powerful than runabouts. CARS, which are four letters long, are a general term for any type of motor vehicle. Finally, AUTO, which is also four letters long, is a shortened version of the word automobile, which is used to refer to any type of motor vehicle.