All investors are long term traders. So yes an investor is a trader but with a long term vision
Well In as much I think I couldn't understand what you are trying to say but from the little I could understand not all investors who buy assets are consider long term holders, as an investor you most focus more on the part of long term strategy buying and hold strategy, while the traders are know for the short term market gains and their are active buying and selling and their are always best at using the technical analysis to predict price movements.
Investors are not traders.
They are two different breeds of activities.
If that wasn't the case, there wouldn't be a term like "investor".