triplet vs threesome

triplet and threesome both are nouns.

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

As nouns, triplet and threesome are synonyms defined as:

triplet and threesome: the cardinal number that is the sum of one and one and one

Other synonyms of triplet include 3, deuce-ace, III, leash, tercet, ternary, ternion, terzetto, three, tierce, trey, triad, trine, trinity, trio, troika.

triplet (noun)	threesome (noun)
a set of three similar things considered as a unit	three people considered as a unit
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
the cardinal number that is the sum of one and one and one