police cruiser vs automobile

police cruiser and automobile both are nouns.

Word	Noun	Adjective	Verb	Adverb
police cruiser	Yes	No	No	No
automobile	Yes	No	Yes	No

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

police cruiser: 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 police cruiser include auto, car, machine, motorcar.

police cruiser (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

police cruiser (verb)	automobile (verb)
	travel in an automobile