triplet vs trilogy

triplet and trilogy both are nouns.

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

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

triplet: 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 triplet include trigon, triplicity.

triplet (noun)	trilogy (noun)
a set of three similar things considered as a unit	a set of three literary or dramatic works related in subject or theme
one of three offspring born at the same time from the same pregnancy
the cardinal number that is the sum of one and one and one