[71RoadRunner]

Those would technically be sports cars. Sports cars are 2 seaters with less than 8 cylinders generally, although the Corvette is usually considered a sports car. Sport compacts are 4 seaters, 2 or 4 door, less than 8 cylinders and usually inexpensive. This is the basic breakdown between the two, the main difference being the seating. I have no idea why, but this is how they seem to be seperated.