prowl car vs automobile

prowl car and automobile both are nouns.

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

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

prowl car: a car in which policemen cruise the streets; equipped with radiotelephonic communications to headquarters
automobile: a motor vehicle with four wheels; usually propelled by an internal combustion engine

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

prowl car (noun)	automobile (noun)
a car in which policemen cruise the streets; equipped with radiotelephonic communications to headquarters	a motor vehicle with four wheels; usually propelled by an internal combustion engine

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