Simplify the following text for a Grade 10 native English-speaking person.
Original: ( from German poltern , meaning to rumble or make noise , and Geist , meaning `` ghost '' , `` spirit '' , or `` embodiment '' ) is a spirit or ghost is able to move and influence objects .
Simplified: The word poltergeist comes from the German words poltern ( `` to make noise '' ) and Geist ( `` spirit '' ) , and the term itself literally means `` noisy ghost '' .