ternion vs deuce-ace

ternion and deuce-ace both are nouns.

Word	Noun	Adjective	Verb	Adverb
ternion	Yes	No	No	No
deuce-ace	Yes	No	No	No

As nouns, ternion and deuce-ace are synonyms defined as:

ternion and deuce-ace: the cardinal number that is the sum of one and one and one

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

ternion (noun)	deuce-ace (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