police cruiser vs police car

police cruiser and police car both are nouns.

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

As nouns, police cruiser and police car are synonyms defined as:

police cruiser and police car: a car in which policemen cruise the streets; equipped with radiotelephonic communications to headquarters

Other synonyms of police cruiser include cruiser, patrol car, prowl car, squad car.

police cruiser (noun)	police car (noun)
a car in which policemen cruise the streets; equipped with radiotelephonic communications to headquarters	a car in which policemen cruise the streets; equipped with radiotelephonic communications to headquarters