Well my own contributions and understanding on your question is that.
Anyone that has bitcoin in the wallet can be called a trader, some may not see their self as a trader because they are not watching the market or reading news about bitcoin, meanwhile bitcoin normally goes up and down and it effect everyone that has bitcoin in the wallets anytime bitcoin makes moves.
At this point you are also a trader but you may not know or consider to be a trader, the only people that that consider to be a trader is those ones that watch the market and know when to buy and sell.
Well my answer goes like this. Anyone that has bitcoin in the wallets is a trader period.
I think trading bitcoin is different from investing, trading happens to be an excess which is short and with the short time the trader is expected to make gain in every trade. While investing bitcoin happens to invest a particular among of money that is expected to be long-term for reasonable amount of profit to be gain from the market. When investing it is not necessary for one to monitor the market all time to check the up and the down of the market, investing is mostly profitable when it is long-term. Trading and investing are two different things .