quartette

(noun) four performers or singers who perform together. Synonyms: quartet.

(noun) a set of four similar things considered as a unit. Synonyms: quartet, quadruplet, quadruple.

(noun) four people considered as a unit. Synonyms: quartet, foursome. Examples: "He joined a barbershop quartet." "The foursome teed off before 9 a.m.."

(noun) a musical composition for four performers. Synonyms: quartet.