The term 'ONE WHO MIGHT SIT IN A HIGH CHAIR' can be summarized as an UMPIRE, which is a 6 letter word. An UMPIRE is an official in a variety of sports who is responsible for enforcing the rules and maintaining order. They are typically positioned in a high chair or elevated platform to get a better view of the playing field. Umpires are usually impartial and make decisions based on the rules of the game.