Ghost - the soul of a dead person manifested physically; a human spirit
Haunted - inhabited by a spiritual being
Poltergeist - a "mischevious" spirit manifesting itself through object manipulation (literal translation from german: polter - noisy geist - ghost)
Demon - a nonhuman entity of negative influence. In religion, demons are believed to be fallen angels at war with god
Exorcism - the expulsion of demonic spirits from a human through religious ceremony
Apparition - the visual manifestation of a ghost
Channeler - a person who is willfully possessed by a spirit in order to communicate with it
Cold Spot - a manifestation of a ghost through a decrease in temperature, usually in a small area
Disembodied Voice - a voice or sound that has no known origin. Also called EVP (Electromagnetic Voice Phenomena)
Intelligent Spirit - a ghost that is concious and can interact with a person, as opposed to a residual haunting
Residual Haunting - a nonconscious spirit that only repeats what happened to it in life
Possession - when a person is taken over by a spirit or entity
Ouija Board - originally a game, the ouija board is the primary tool for communicating with ghosts and spirits
(WARNING! Many experts consider the ouija board a very dangerous tool. Use at your own risk.)