carriage vs Pullman car

carriage and Pullman car both are nouns.

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

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

carriage (noun)	Pullman car (noun)
a vehicle with wheels drawn by one or more horses	luxurious passenger car; for day or night travel
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