carriage vs passenger train

carriage and passenger train both are nouns.

Word	Noun	Adjective	Verb	Adverb
carriage	Yes	No	No	No
passenger train	Yes	No	No	No

carriage (noun)	passenger train (noun)
a vehicle with wheels drawn by one or more horses	a train that carries passengers
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