In car lingo, the definitions are:
Roadster - 2 Door, 2 seater with no fixed roof (think early Viper)
Spider - 2 Door car with a removable/retractable roof
Convertable/Cabriolet - Any number of doors and a removable/retractable roof
Targa - Any number of doors with a removable roof mid-section
Coupe - 2 Door car with no hatch (also called a berlinetta)
Hatchback - 3 Door car with a hatch
Sedan - 4 Door car with no hatch
Wagon - 4 Door car with a hatch
Ford may call it a sedan, but they are technically incorrect.
Anyhow, a notchback is slang for "coupe" in mustang speak.