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)tripletone of three offspring born at the same time from the same pregnancy
(n)trio, triad, triplet, triplea set of three similar things considered as a unit