ternion vs terzetto

ternion and terzetto both are nouns.

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

As nouns, ternion and terzetto are synonyms defined as:

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

ternion (noun)	terzetto (noun)
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