Nouns

(n)pair, bracea set of two similar things considered as a unit
(n)couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duo, duet, dyad, duadtwo items of the same kind
(n)pairtwo people considered as a unit
(n)paira poker hand with 2 cards of the same value

Verbs

(v)pair, pair off, partner off, coupleform a pair or pairs“The two old friends paired off”
(v)match, mate, couple, pair, twinbring two objects, ideas, or people together“This fact is coupled to the other one”, “Matchmaker, can you match my daughter with a nice young man?”, “The student was paired with a partner for collaboration on the project”
(v)pair, geminateoccur in pairs
(v)pair, geminatearrange in pairs“Pair these numbers”
(v)copulate, mate, pair, coupleengage in sexual intercourse“Birds mate in the spring”