trilogy vs trio

trilogy and trio both are nouns.

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

As nouns, trio is a hypernym of trilogy; that is, trio is a word with a broader meaning than trilogy:

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

Other hypernyms of trilogy include triad, triple, triplet.

trilogy (noun)	trio (noun)
a set of three literary or dramatic works related in subject or theme	a musical composition for three performers
	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