A transom window is a type of window that is placed above a door or another window. It is a decorative window that is usually used to allow more light and air into a room. There are several synonyms for the term transom window. These include fanlight, transom light, overdoor window, and transom fan. Fanlight is a popular term for a transom window, and the term is derived from the shape of the window, which is often designed in a fan shape. Transom light is another term that is commonly used to describe this type of window, and it refers to the fact that the window is located above a door. Other terms, like overdoor window and transom fan, are also used to describe these windows depending on their design.