"Speculatist" is a word in ENGLISH

anít - Flayed, peeled; fleeced; one who has lost heavily in gambling, speculation, or the like. (cf. ánit).

One who speculates or forms opinions independently of the authority of others; esp., in the sphere or religion, one who …

A simple, unsophisticated person; in the cant of the Stock Exchange, one who ignorantly speculates and is victimized.

One who bets heavily and recklessly on a race; a reckless speculator.

To make restoration or payment of an equivalent to (a person); to pay back to; to indemnify; -- often reflexive; …

A game at cards in which the players buy from one another trumps or whole hands, upon a chance of …

One who speculates. Specifically: (a) An observer; a contemplator; hence, a spy; a watcher.

One who engages in speculation; one who buys and sells goods, land, etc., with the expectation of deriving profit from …

One who forms theories; a theorist.

One who speculates in stocks for gain; one whose occupation is to buy and sell stocks. In England a jobber …

One who forms theories; one given to theory and speculation; a speculatist.

One who theorizes or speculates; a theorist.