police car vs panda car

police car and panda car both are nouns.

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

As nouns, panda car is a hyponym of police car; that is, panda car is a word with a more specific, narrower meaning than police car:

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

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