a person who is engaged in commercial or financial speculation.
a person who makes advance purchases of tickets, as to games or theatrical performances, that are likely to be in demand, for resale later at a higher price.
a person who is devoted to mental speculation.

1545–55; < Latin speculātor explorer, equivalent to speculā() to watch over, explore, reconnoiter (see speculate) + -tor -tor

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World English Dictionary
speculator (ˈspɛkjʊˌleɪtə)
1.  a person who speculates
2.  (NZ) rugby an undirected kick of the ball

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1778 in the financial sense; from speculation (q.v.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But when it comes to commodities, pundits claim that speculators cause the
  price of the underlying commodity to increase.
There is nothing wrong with speculation, but its social value is not as great
  as the profits of successful speculators.
But mostly speculators, amateur and otherwise, were getting on for the ride.
Populists sought to ensure that this land went to small farmers rather than
  large landowners or speculators.
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