go-kart vs motor vehicle

go-kart and motor vehicle both are nouns.

Word	Noun	Adjective	Verb	Adverb
go-kart	Yes	No	No	No
motor vehicle	Yes	No	No	No

As nouns, motor vehicle is a hypernym of go-kart; that is, motor vehicle is a word with a broader meaning than go-kart:

go-kart: a small low motor vehicle with four wheels and an open framework; used for racing
motor vehicle: a self-propelled wheeled vehicle that does not run on rails

Other hypernyms of go-kart include automotive vehicle.

go-kart (noun)	motor vehicle (noun)
a small low motor vehicle with four wheels and an open framework; used for racing	a self-propelled wheeled vehicle that does not run on rails