manes vs poltergeist

manes

noun
  • The souls or spirits of dead ancestors, conceived as deities or the subjects of reverence, or of other deceased relatives. 

poltergeist

noun
  • An unseen ghost which makes noises and causes disruption, especially by causing physical objects to move or fly about. 

How often have the words manes and poltergeist occurred in a corpus of books? (source: Google Ngram Viewer )