roadster vs carriage

roadster and carriage both are nouns.

Word	Noun	Adjective	Verb	Adverb
roadster	Yes	No	No	No
carriage	Yes	No	No	No

As nouns, carriage is a hypernym of roadster; that is, carriage is a word with a broader meaning than roadster:

Other hypernyms of roadster include equipage, rig.

roadster (noun)	carriage (noun)
a small lightweight carriage; drawn by a single horse	a vehicle with wheels drawn by one or more horses
an open automobile having a front seat and a rumble seat	a railcar where passengers ride
	a machine part that carries something else
	a small vehicle with four wheels in which a baby or child is pushed around
	characteristic way of bearing one's body