hardtop vs motorcar

hardtop and motorcar both are nouns.

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

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

hardtop: a car that resembles a convertible but has a fixed rigid top
motorcar: a motor vehicle with four wheels; usually propelled by an internal combustion engine

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

hardtop (noun)	motorcar (noun)
a car that resembles a convertible but has a fixed rigid top	a motor vehicle with four wheels; usually propelled by an internal combustion engine