Someone who makes conjectures without knowing the facts.
Roget 799a: stock market, stock exchange, securities exchange; bourse, board; the big board, the New York Stock Exchange; the market, the open market; over-the-counter market; privately traded issues. commodities exchange, futures exchange, ... show more
Someone who risks losses for the possibility of considerable gains.
Moby thesaurus: adventurer, armchair authority, betting ring, bettor, big operator, boneshaker, cardshark, cardsharp, cardsharper, casuist, compulsive gambler, cosmologist, crap shooter, doctrinaire, doctrinarian, gambler, gamester, gunslinger, hazarder, hypothesist ... show more.
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