Ghost
The word "Ghost" refers to the "spirit" or "soul" of a deceased person, or any spirit or demon.
Ghost are often associated with hauntings, which is, according to the Parapsychological Association, " the more or less regular occourance of paranormal phenomena associated with a particular locality (especially a building) and usually attributed to the activities of a discarnate entity; the phenomena may include apparitions, poltergiest disturbance, cold drafts, sounds of footsteps and voices, and various odors.
Paranormal
Paranormal is a umbrella word to describe unsual phenomena or experiences that lack obvious scientific explanation.
bravenet.com