Afterlife - A life or existence believed to follow death.

Apparition - A ghostly figure; a specter.

Astral - Relating to a supersensible body believed by theosophists to coexist with and survive the death of the human physical body: an astral body, astral projection.

Aura - A distinctive but intangible quality that seems to surround a person or thing. Often seen as colors.

Doppelganger - A German word for double goer, meaning a ghostly double of a living person, especially one that haunts its fleshly counterpart.

Ectoplasm - An immaterial or ethereal substance, especially the transparent corporeal presence of a spirit or ghost.

Electromagnetic - pertaining to or exhibiting magnetism produced by electric charge in motion.

EMF - Electro Magnetic Field

Entity - that which is known to have its own distinct existence (living or nonliving)

EVP - Electronic Voice Phenomenon

Ghost - The center of spiritual life; the soul.

Haunt - To inhabit, visit, or appear to in the form of a ghost or other supernatural being.

Incubus - An male demon that descends upon and has sexual intercourse with women as they sleep.

Infrared - having or employing wavelengths longer than light but shorter than radio waves; lying outside the visible spectrum at its red end.

Necromancy - conjuring spirits of the dead for the purpose of revealing the future or influencing the course of events.

Paranormal - Beyond the range of normal experience or scientific explanation.

Parapsychology - The study of the evidence for psychological phenomena.

Poltergeist - ghost that manifests itself by noises, rappings, and the creation of disorder. Noisy ghost.

Portal - An entrance, or gate, especially one that is large and imposing.

Possession - being controlled by something supernatural.

Reincarnation - Rebirth of the soul in another body.

Repeater - A spirit that continually relives a certain moment in it's life.

Succubus - A female demon that descends upon and has sexual intercourse with men as they sleep.

Supernatural - Of or relating to existence outside the natural world.

Vortex - A place or situation regarded as drawing into its center all that surrounds it.