Spiritualist

One who professes a regard for spiritual things only; one whose employment is of a spiritual character; an ecclesiastic.

One who maintains the doctrine of spiritualism.

One who believes in direct intercourse with departed spirits, through the agency of persons commonly called mediums, by means of physical phenomena; one who attempts to maintain such intercourse; a spiritist.

Spiritualistic.

someone who serves as an intermediary between the living and the dead; "he consulted several mediums"