phaeton vs auto

phaeton and auto both are nouns.

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

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

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

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

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