The term 'Poltergeist Sounds' can be summarized as a series of loud THUMPS, which are believed to be caused by supernatural entities. The term is derived from the German word 'poltern, ' which means 'to make noise.' The term is often associated with paranormal activity, such as hauntings and poltergeists. The 6-letter solution for this term is 'THUMPS, ' which accurately describes the loud, unexplained noises that are associated with poltergeist activity.