carriage vs parlor car

carriage and parlor car both are nouns.

Word	Noun	Adjective	Verb	Adverb
carriage	Yes	No	No	No
parlor car	Yes	No	No	No

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

carriage: a railcar where passengers ride
parlor car: a passenger car for day travel; you pay extra fare for individual chairs

carriage (noun)	parlor car (noun)
a vehicle with wheels drawn by one or more horses	a passenger car for day travel; you pay extra fare for individual chairs
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