threesome vs trey

threesome and trey both are nouns.

Word	Noun	Adjective	Verb	Adverb
threesome	Yes	No	No	No
trey	Yes	No	No	No

As nouns, threesome and trey are synonyms defined as:

threesome and trey: the cardinal number that is the sum of one and one and one

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

threesome (noun)	trey (noun)
three people considered as a unit	one of four playing cards in a deck having three pips
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