triplet vs ternion

triplet and ternion both are nouns.

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

As nouns, triplet and ternion are synonyms defined as:

triplet and ternion: 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, terzetto, three, threesome, tierce, trey, triad, trine, trinity, trio, troika.

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