police cruiser vs motorcar

police cruiser and motorcar both are nouns.

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

As nouns, motorcar is a hypernym of police cruiser; that is, motorcar 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
motorcar: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of police cruiser include auto, automobile, car, machine.

police cruiser (noun)	motorcar (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