The term 'STADIUM TOP' can be solved by the four-letter word 'DOME'. A DOME is a structure that is typically built on top of a stadium, and is usually made of a material such as concrete or steel. It is designed to protect the stadium from the elements, such as rain or snow, and also to provide a more aesthetically pleasing look. The DOME also helps to amplify sound within the stadium, making it easier for spectators to hear the game.