phaeton vs motorcar

phaeton and motorcar both are nouns.

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

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

phaeton: large open car seating four with folding top
motorcar: a motor vehicle with four wheels; usually propelled by an internal combustion engine

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

phaeton (noun)	motorcar (noun)
large open car seating four with folding top	a motor vehicle with four wheels; usually propelled by an internal combustion engine