Noun
speculator -
someone who risks losses for the possibility of considerable gains
plunger
adventurer ,
venturer a person who enjoys taking risks
gambler a person who wagers money on the outcome of games or sporting events
hedger a gardener who takes care of and trims hedges
operator an agent that operates some apparatus or machine; "the operator of the switchboard"
scalper someone who buys something and resells it at a price far above the initial cost; "he got theater tickets through a scalper"
speculator -
someone who makes conjectures without knowing the facts
thinker an important intellectual; "the great minds of the 17th century"
