trio vs trilogy

trio and trilogy both are nouns.

Word	Noun	Adjective	Verb	Adverb
trio	Yes	No	No	No
trilogy	Yes	No	No	No

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

trio: a set of three similar things considered as a unit
trilogy: a set of three literary or dramatic works related in subject or theme

Other hyponyms of trio include trigon, triplicity.

trio (noun)	trilogy (noun)
a musical composition for three performers	a set of three literary or dramatic works related in subject or theme
three people considered as a unit
a set of three similar things considered as a unit
three performers or singers who perform together
the cardinal number that is the sum of one and one and one