compact car vs automobile

compact car and automobile both are nouns.

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

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

compact car: a small and economical car
automobile: a motor vehicle with four wheels; usually propelled by an internal combustion engine

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

compact car (noun)	automobile (noun)
a small and economical car	a motor vehicle with four wheels; usually propelled by an internal combustion engine

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