This is just a matter of semantics.
Soros was a trader in the very beginning of his 'career' (he was an 'arbitrage trader' for a brokerage firm in NY.) but it is much more accurate to describe him as a hedge fund manager. He uses his knowledge of economics, market Psychology etc. to make 'investments' in what he thinks is going to go up and short what he thinks is going to go down.
Is that what we mean by 'trading'??
e.g. Soros shorted Deutsche bank the day after the Brexit vote.
http://www.bloomberg.com/news/artic...ed-deutsche-bank-would-drop-in-brexit-turmoil
Are such hedge fund managers 'traders'?