The term 'Haunted Castle Sound' can be summarized as a CLANK, which is a five-letter word. CLANK is a sound that is often associated with haunted castles, such as the sound of metal chains being dragged across the floor or the sound of a heavy door slamming shut. It is also used to describe the sound of metal objects colliding with each other. CLANK is a sound that is often used in horror movies and stories to create an atmosphere of suspense and fear.