ambulance vs automobile

ambulance and automobile both are nouns.

Word	Noun	Adjective	Verb	Adverb
ambulance	Yes	No	No	No
automobile	Yes	No	Yes	No

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

ambulance: a vehicle that takes people to and from hospitals
automobile: a motor vehicle with four wheels; usually propelled by an internal combustion engine

Other hypernyms of ambulance include auto, car, machine, motorcar.

ambulance (noun)	automobile (noun)
a vehicle that takes people to and from hospitals	a motor vehicle with four wheels; usually propelled by an internal combustion engine

ambulance (verb)	automobile (verb)
	travel in an automobile