prognosticator

noun

1. One who prognosticates or makes predictions; one who forecasts or guesses.

   “Plenty of prognosticators try to forecast the ups and downs of the market.”

   “Thou art wearied in the multitude of thy counsels: let now the astrologers, the starre-gazers, the monethly prognosticators stand vp, and saue thee from these things that shall come vpon thee.”

   “When the staccato, Neptunes-ian single “Boyfriend” was released in March, musical prognosticators were quick to peg the album it portended, Believe, as Justin Bieber’s Justified, a grown-and-sexy, R&B-centric departure that evolved millennial teenybopper Justin Timberlake into one of the unifying pop-music figures of the aughts.”

   “On Long Bets, a website where prognosticators test their mettle by playing for real (or at least proceeds-donated-to-charity) stakes, there is an open bet between the British astrophysicist Martin Rees, a noted worrier over apocalyptic possibilities, and Harvard University’s Steven Pinker, famous for his vaulting optimism.”