foursome

• POS: Noun
• HYPHEN: four=some

CIDE DICTIONARY

foursome, a. [Four + 2d -some.].

 Consisting of four; requiring four participants.  [Webster 1913 Suppl.]

foursome, n. 

•  A game between four players, with two on each side and each side playing but one ball, the partners striking alternately. It is called a mixed foursome when each side consists of a man and a woman.  [Webster 1913 Suppl.]
•  A group of four people or objects; as, we need another player to make a foursome for bridge.  [PJC]

OXFORD DICTIONARY

foursome, n.
1 a group of four persons.
2 a golf match between two pairs with partners playing the same ball.

THESAURUS

foursome

Little Joe, biquadrate, bout, contest, decathlon, double-header, doubles, event, four, four-part diaphony, game, games of chance, go, match, meet, pentathlon, play, play-off, quad, quadrangle, quadrature, quadrennium, quadrilateral, quadrille, quadrinomial, quadruplet, quartet, quatern, quaternary, quaternion, quaternity, quatrefoil, race, rectangle, runoff, singles, sport, square, square dance, squaring, tetrad, tetragon, tetragram, tetragrammaton, tetrahedron, tetralogy, tetraphony, tetrapody, threesome, twosome