TWOSOME
couple, twosome, duo, duet
(noun) a pair who associate with one another; “the engaged couple”; “an inseparable twosome”
couple, pair, twosome, twain, brace, span, yoke, couplet, distich, duo, duet, dyad, duad
(noun) two items of the same kind
Source: WordNet® 3.1
Etymology
Adjective
twosome (not comparable)
Being or constituting a pair; two.
Twofold; double.
Performed by two individuals.
Synonyms
• (twofold): twissel; see also twofold
Noun
twosome (plural twosomes)
A group of two; a pair; a couple; a group of two distinct individuals or components.
A dance for two people.
Synonyms
• (group of two): duet, duo, pair; see also duo
Source: Wiktionary