ambulance vs motorcar

ambulance and motorcar both are nouns.

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

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

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

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

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