carriage vs buggy

carriage and buggy both are nouns.

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

As nouns, buggy is a hyponym of carriage; that is, buggy is a word with a more specific, narrower meaning than carriage:

carriage (noun)	buggy (noun)
a vehicle with wheels drawn by one or more horses	a small lightweight carriage; drawn by a single horse
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

carriage (adjective)	buggy (adjective)
	infested with bugs
	informal or slang terms for mentally irregular