deuce-ace vs triad

deuce-ace and triad both are nouns.

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

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

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

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

deuce-ace (noun)	triad (noun)
the cardinal number that is the sum of one and one and one	a three-note major or minor chord; a note and its third and fifth tones
	three people considered as a unit
	a set of three similar things considered as a unit
	the cardinal number that is the sum of one and one and one