Investors could also be gamblers but gamblers are gamblers. They could have other investments and they can take more risk than the usual person who seeks investments.
Even investors may go for gambling because they are having enough time to correct the mistake if anything goes wrong whereas traders should not gamble because the time frame is very small and they may get enforced to exit at stoploss. In my opinion, traders also be gambler and not investors but gamblers cannot be traders or investors just through gambling.
they won't be called investors if they don't have a lot of experience in investing
After bitcoin, I would say that your experience will be least bothered; you can gamble with bitcoin investments but the only catch should be, you must need enough patience which may last up to 4 years as well.