ternion vs triplet

ternion and triplet both are nouns.

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

As nouns, ternion and triplet are synonyms defined as:

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

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

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