Source : Webster's Revised Unabridged Dictionary (1913)

Diviner \Di*vin"er\, n.
   1. One who professes divination; one who pretends to predict
      events, or to reveal occult things, by supernatural means.

            The diviners have seen a lie, and have told false
            dreams; they comfort in vain.         --Zech. x. 2.

   2. A conjecture; a guesser; one who makes out occult things.
      --Locke.

Source : WordNet®

diviner
     n : someone who claims to discover hidden knowledge with the aid
         of supernatural powers