The term 'haunting' has been misused in recent decades. There
are four classes of apparitional experiences of which one is the
haunting apparition or 'haunting' for short. These are sometimes
called 'residual' in modern terms. The other three types of
apparitions are considered 'intelligent' or interactive in nature
(and might therefore be called 'active'). The term 'ghost'
originally applied only to the haunting apparitions. Over time it
too has been appropriated into a more general term to describe a
variety of loosely related paranormal phenomena.