The term 'stadium roof, perhaps' can be summarized by the crossword solution 'DOME, ' which is a four-letter word. A DOME is a type of roof structure that is typically constructed in the shape of a half-sphere or hemisphere. It is often used to cover large public spaces such as stadiums, churches, and other large buildings. Domes are usually made of concrete, steel, or other materials that are strong enough to support the weight of the structure.