speculator

noun4

1. •
   One who speculates; as in investing, one who is willing to take volatile risks upon invested principal for the potential of substantial returns.

   • But it would be very unjust to think of all the Railway Members as speculators and simply out to feather their own nests, not that it is fair to think of George Hudson in this light alone. — 1960
2. •
   One who speculates; an observer; a contemplator.
3. •
   One who forms theories; a theorist.

   • […] in things of Fact, the People are as much to be believed, as the most subtle Philosophers and Speculators, since here sense is the Judge. — 1666
4. •
   Synonym of field goal.