coupe vs auto

coupe and auto both are nouns.

Word	Noun	Adjective	Verb	Adverb
coupe	Yes	No	No	No
auto	Yes	No	No	No

As nouns, auto is a hypernym of coupe; that is, auto is a word with a broader meaning than coupe:

coupe: a car with two doors and front seats and a luggage compartment
auto: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of coupe include automobile, car, machine, motorcar.

coupe (noun)	auto (noun)
a car with two doors and front seats and a luggage compartment	a motor vehicle with four wheels; usually propelled by an internal combustion engine