spiritualist >> ˈspɪrɪtʃ(ʊ)əlɪst
Definition: [noun] a person who believes that the spirits of the dead can communicate with living people.
Example: he became an ardent spiritualist, attending seances and insisting on their authenticity
Definition: [noun] an advocate of the doctrine that the spirit exists as distinct from matter, or that spirit is the only reality.
Example: a non-denominational spiritualist
Definition: [adjective] relating to the belief that the spirits of the dead can communicate with living people.
Example: spiritualist mediums who claim to be able to contact the dead