Do you consider these three entities mentioned in title same thing or different? If latter, what's difference between each of these entities?
This three group of crypto enthusiast, traders, holder and investors are not the same.
Here are some of their differences.
Traders are those who buy or sell assets like cryptocurrency, stock, bond, fiat currencies in order to earn profit. Long term traders, are those who take trading assets as their occupation or profession.
Investors are in two categories; short and long term investors. short term investors are those who hold an asset for short period like 1year, while Long term investors are those who hold assets positions for a long term like 5 years or above.
Holders can also be considered to be another form of a short term investors but they hold an asset for a short positions of less than 6months hoping to sell once the market prices move up to certain levels. They hold assets for a short time to take advantage of rising prices.