CIRCLE CHAMBER' (7 letters) The term 'ROUND ROOM' can be solved by two crossword solutions: 'ROTUNDA' (7 letters) and 'CIRCLE CHAMBER' (7 letters). A rotunda is a circular building with a dome-shaped roof, often found in public spaces such as parks or government buildings. A CIRCLE CHAMBER is a room that is round in shape, usually with a domed ceiling. Both terms refer to a room that is round in shape, and both are commonly used to describe the same type of space.