runabout vs auto

runabout and auto both are nouns.

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

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

runabout: an open automobile having a front seat and a rumble seat
auto: a motor vehicle with four wheels; usually propelled by an internal combustion engine

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

runabout (noun)	auto (noun)
an open automobile having a front seat and a rumble seat	a motor vehicle with four wheels; usually propelled by an internal combustion engine