troika vs triumvirate

troika and triumvirate both are nouns.

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

As nouns, triumvirate is a hypernym of troika; that is, triumvirate is a word with a broader meaning than troika:

troika: a modern Russian triumvirate
triumvirate: a group of three men responsible for public administration or civil authority

troika (noun)	triumvirate (noun)
a Russian carriage pulled by three horses abreast	a group of three men responsible for public administration or civil authority
a modern Russian triumvirate
the cardinal number that is the sum of one and one and one