Prefixcompound; composite; multiple; re-; bi- · doubles (tennis, badminton, etc.) · place bet (in horse racing, etc.); show bet; bet that predicts a top 2 or top 3 finish (depending on number of horses, etc. in race)

Nounsimplicity and complexity; singular and plural; single and double; singles and doubles (in tennis)

Nounquinella (bet); dual forecast; reverse forecast

Noungene duplication