terzetto vs ternion

terzetto and ternion both are nouns.

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

As nouns, terzetto and ternion are synonyms defined as:

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

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

terzetto (noun)	ternion (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