Nouns

(n)three, 3, III, trio, threesome, tierce, leash, troika, triad, trine, trinity, ternary, ternion, triplet, tercet, terzetto, trey, deuce-acethe cardinal number that is the sum of one and one and one
(n)trioa musical composition for three performers
(n)triothree performers or singers who perform together
(n)trio, triad, triplet, triplea set of three similar things considered as a unit
(n)trio, threesome, triad, trinitythree people considered as a unit