The term TOP OF A ROOM can be solved by the crossword solution CEILING, which is a seven-letter word. The CEILING of a room is the uppermost part of the interior space, usually made of a flat surface that is perpendicular to the walls and floor. It is often used to separate the room from other rooms in the same building. Ceilings can be made of various materials, such as wood, plaster, or drywall, and can be painted or decorated with wallpaper or other materials.