patrol car vs police cruiser

patrol car and police cruiser both are nouns.

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

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

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

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

patrol car (noun)	police cruiser (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