SUV vs motorcar

SUV and motorcar both are nouns.

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

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

SUV: a high-performance four-wheel drive car built on a truck chassis
motorcar: a motor vehicle with four wheels; usually propelled by an internal combustion engine

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

SUV (noun)	motorcar (noun)
a high-performance four-wheel drive car built on a truck chassis	a motor vehicle with four wheels; usually propelled by an internal combustion engine