carriage vs troika

carriage and troika both are nouns.

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

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

carriage (noun)	troika (noun)
a vehicle with wheels drawn by one or more horses	a Russian carriage pulled by three horses abreast
a railcar where passengers ride	a modern Russian triumvirate
a machine part that carries something else	the cardinal number that is the sum of one and one and one
a small vehicle with four wheels in which a baby or child is pushed around
characteristic way of bearing one's body