1. someone who claims to discover hidden knowledge with the aid of supernatural powers
The Collaborative International Dictionary of English v.0.48:
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.
WordNet (r) 3.0 (2006):
n 1: someone who claims to discover hidden knowledge with the
aid of supernatural powers
Moby Thesaurus II by Grady Ward, 1.0:
47 Moby Thesaurus words for "diviner":
Cassandra, Comus, Druid, Faust, astrologer, augur, calamity howler,
conjurer, crystal gazer, diabolist, divinator, divineress, dowser,
forecaster, foreknower, foreseer, foreshower, foreteller,
fortuneteller, geomancer, haruspex, miracle-worker, necromancer,
palmist, predictor, prefigurer, presager, prognosticator,
prophesier, prophet, prophet of doom, prophetess, psychic,
pythoness, religious prophets, seer, seeress, soothsayer, sorcerer,
thaumaturge, thaumaturgist, theurgist, vates, warlock, water witch,
weather prophet, wizard