twosome (n.)

• bout
• brace
• contest
• couple
• couplet
• decathlon
• distich
• doubles
• doublet
• duad
• duet
• duo
• dyad
• event
• foursome
• game
• go
• match
• mates
• meet
• pair
• pentathlon
• play
• race
• runoff
• singles
• span
• sport
• team
• threesome
• twain
• two
• yoke