(n.) One who prognosticates; a foreknower or foreteller of a future course or event by present signs.

Cassandra Druid astrologer augur calamity howler crystal gazer divinator diviner divineress forecaster foreknower foreseer foreshower foreteller fortuneteller geomancer haruspex palmist predictor prefigurer presager prophesier prophet prophet of doom prophetess psychic pythoness religious prophets seer seeress soothsayer vates weather prophet