squad car vs automobile

squad car and automobile both are nouns.

Word	Noun	Adjective	Verb	Adverb
squad car	Yes	No	No	No
automobile	Yes	No	Yes	No

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

squad car: 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 squad car include auto, car, machine, motorcar.

squad car (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

squad car (verb)	automobile (verb)
	travel in an automobile