Cautioner

1. (n.) One who cautions or advises.

2. (n.) A surety or sponsor.

Thesaurus Entries

Druid, Eeyore, Jeremiah, admonisher, astrologer, augur, calamity howler, cautioner, crepehanger, crystal gazer, cynic, defeatist, divinator, diviner, divineress, flagman, forecaster, foreknower, foreseer, foreshower, foreteller, fortuneteller, geomancer, haruspex, killjoy, lighthouse keeper, lookout, lookout man, malist, monitor, negativist, nihilist, palmist, pessimist, predictor, prefigurer, presager, prognosticator, prophesier, prophet, prophet of doom, prophetess, psychic, pythoness, religious prophets, retreatist, seek-sorrow, seer, seeress, sentinel, sentry, signaler, signalman, soothsayer, vates, warner, weather prophet, worrywart