What do you call someone who believes in ghosts and ghost stories?
There is a word eidolism which means a belief in ghosts; see this Google search.
Though it doesn't appear in most dictionaries, and may be one of those words that largely exists only as a definition on esoteric word lists, it does appear in some odd books.
But I couldn’t find any actual usage of the corresponding word you’d expect to refer to a believer in ghosts: eidolist.
If you are an adult and take that subject seriously, you may be called a "spiritualist". If you simply believe they exist and fear their possible appearance, you are "superstitious", even though this word is not specific for ghosts and can be used for several other beliefs which are not based on reason or knowledge.
I think they are also simply called: Ghost-believers:
Of the 1,000 adults interviewed Dec. 17-18, the HuffPost/YouGov poll revealed 45 percent believe in ghosts, or that the spirits of dead people can come back in certain places and situations. When asked if they believe there's a life after death, 64 percent responded Yes. While 59 percent of adults don't believe they've ever actually seen a ghost, 43 percent also don't think that ghosts or spirits can harm or interact with living
Do you believe in ghosts? I do. If you do, please join this group. Are you an non-believer of ghosts and people keep fighting with you saying there are ghosts out there, then I suggest you to join this group also!
apparitionist (pl. apparitionists)
A believer in apparitions.
Related words & phrases
Animism (thus animist) covers this sense also.
- The belief in the existence of individual spirits that inhabit natural objects and phenomena.
- The belief in the existence of spiritual beings that are separable or separate from bodies.
Wikipedia mentions that:
The belief in manifestations of the spirits of the dead is widespread, dating back to animism or ancestor worship in pre-literate cultures.
Also a definition from "Dictionary of the Social Sciences" edited by Craig Calhoun:
Note: Animism covers believing in both souls and ghosts.