Origin: Greek suffix -ist
Poltergeist has 3 different meanings across 2 categories:
a ghost that announces its presence with rapping and the creation of disorder
An unseen ghost which makes noises and causes disruption, especially by causing physical objects to move or fly about.
One of the pair of planets that were the first exoplanets which were discovered. A planet in orbit of the pulsar Lich (PSR B1257+12)