duo

(noun) two items of the same kind. Synonyms: couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duet, dyad, duad.

(noun) two performers or singers who perform together. Synonyms: duet, duette.

(noun) a pair who associate with one another. Synonyms: couple, twosome, duet. Examples: "The engaged couple." "An inseparable twosome."

(noun) a musical composition for two performers. Synonyms: duet, duette.