The sport that uses the term scrum to describe the contest for possession of the ball is rugby. A scrum occurs after certain stoppages in play, where players from both teams bind together and push against each other to win the ball. This contest emphasizes teamwork, strength, and strategy, as players work in unison to gain possession. The scrum is a fundamental aspect of rugby, illustrating the physicality and tactical complexity inherent in the game, making it an exciting part of the sport.