car vs carriage

car and carriage both are nouns.

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

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

car (noun)	carriage (noun)
a motor vehicle with four wheels; usually propelled by an internal combustion engine	a vehicle with wheels drawn by one or more horses
a wheeled vehicle adapted to the rails of railroad	a railcar where passengers ride
where passengers ride up and down	a machine part that carries something else
the compartment that is suspended from an airship and that carries personnel and the cargo and the power plant	a small vehicle with four wheels in which a baby or child is pushed around
a conveyance for passengers or freight on a cable railway	characteristic way of bearing one's body