The term 'Grandstand Group' refers to the collective of people who attend a sporting event. This group includes SPECTATORS (10 letters), ROOTERS (7 letters), and FANS (4 letters). SPECTATORS are those who watch the game from the stands, ROOTERS are those who cheer on their team, and FANS are those who are devoted to a particular team or sport. All three of these groups make up the Grandstand Group and contribute to the atmosphere of a sporting event.