runabout vs two-seater

runabout and two-seater both are nouns.

Word	Noun	Adjective	Verb	Adverb
runabout	Yes	No	No	No
two-seater	Yes	No	No	No

As nouns, runabout and two-seater are synonyms defined as:

runabout and two-seater: an open automobile having a front seat and a rumble seat

Other synonyms of runabout include roadster.

runabout (noun)	two-seater (noun)
an open automobile having a front seat and a rumble seat	an open automobile having a front seat and a rumble seat