Investors
They do hold for long term and long term alone, ranging from 6 months to years.
I will respond to say that in this way, investors don't only hold for long time alone. Yes they are investors who buy coins but they buy and can dump with short time as they see situation of market. If they dump in short time, it doesn't change that they are not investors .
Traders
They are the ones that make use of short term to trade like arbitrage, day trading and scalping.
Well maybe we can say those that intend to go in and out from trade because they see reason to leave or enter