triad vs triumvirate

triad and triumvirate both are nouns.

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

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

triad: three people considered as a unit
triumvirate: a group of three men responsible for public administration or civil authority

triad (noun)	triumvirate (noun)
a three-note major or minor chord; a note and its third and fifth tones	a group of three men responsible for public administration or civil authority
three people considered as a unit
a set of three similar things considered as a unit
the cardinal number that is the sum of one and one and one