Roget's Thesaurus: Entry 513 (Oracle)

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#513. Oracle.-- N. oracle; prophet, prophesier, seer, soothsayer, augur, fortune teller, crystal gazer[obs], witch, geomancer[obs], aruspex[obs]; aruspice[obs], haruspice[obs]; haruspex; astrologer, star gazer[obs]; Sibyl; Python, Pythoness[obs]; Pythia; Pythian oracle, Delphian oracle; Monitor, Sphinx, Tiresias, Cassandra[obs], Sibylline leaves; Zadkiel, Old Moore; sorcerer &c. 994; interpreter &c. 524.

[person who predicts by non-mystical (natural) means] predictor, prognosticator, forecaster; weather forecaster, weatherman.

Phr. a prophet is without honor in his own country; "you don't need a weatherman to know which way the wind blows" [Bob Dylan]. SECTION VII. CREATIVE THOUGHT