The term 'WHAT GHOSTS DO' can be summarized as 'HAUNT', which is a five letter word. Haunting is a phenomenon that has been reported throughout history, and is often associated with supernatural entities such as ghosts. It typically involves the presence of an entity in a particular location, often accompanied by strange noises or other paranormal activity. Haunting is often seen as a sign of a spirit's presence, and is believed to be a way for them to communicate with the living.