sports car vs motorcar

sports car and motorcar both are nouns.

Word	Noun	Adjective	Verb	Adverb
sports car	Yes	No	No	No
motorcar	Yes	No	No	No

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

sports car: a small low car with a high-powered engine; usually seats two persons
motorcar: a motor vehicle with four wheels; usually propelled by an internal combustion engine

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

sports car (noun)	motorcar (noun)
a small low car with a high-powered engine; usually seats two persons	a motor vehicle with four wheels; usually propelled by an internal combustion engine