sport car vs automobile

sport car and automobile both are nouns.

Word	Noun	Adjective	Verb	Adverb
sport car	Yes	No	No	No
automobile	Yes	No	Yes	No

As nouns, automobile is a hypernym of sport car; that is, automobile is a word with a broader meaning than sport car:

sport car: a small low car with a high-powered engine; usually seats two persons
automobile: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of sport car include auto, car, machine, motorcar.

sport car (noun)	automobile (noun)
a small low car with a high-powered engine; usually seats two persons	a motor vehicle with four wheels; usually propelled by an internal combustion engine

sport car (verb)	automobile (verb)
	travel in an automobile