electric car vs motorcar

electric car and motorcar both are nouns.

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

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

electric car: a car that is powered by electricity
motorcar: a motor vehicle with four wheels; usually propelled by an internal combustion engine

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

electric car (noun)	motorcar (noun)
a car that is powered by electricity	a motor vehicle with four wheels; usually propelled by an internal combustion engine