Getting back to the original point...
Motive is key. Gamblers, traders and speculators all put their principal at high risk in the uncertain hope of making extra money. Investors put their principal at low risk in order to protect it from certain deterioration due to inflation / bank charges etc.
Personally I don't see how anything stock-market based can be an investment - including pension schemes.
The difference between a gambler, trader and speculator? Semantics. Gambler = loser, trader = professional, speculator = rich already.
I quite enjoy telling people that I'm learning to gamble on the stock market and that I have a "method" - and watch them take two steps backwards like it might be catching.
However, any business is a gamble; be it running a casino or a recruitment agency, a factory or an ISP. Every time you sign a lease, every bit of equipment you buy, every employee you hire - every action requires a cost to be risked, every decision is a measured gamble of failure versus reward.
My personal differentiator between a pure-gamble, a speculation-gamble and a trade-gamble is the level of calculated risk versus reward. Personally, I define a pure-gamble as a calculated zero or less chance of gain; a speculation-gamble as an unknown or incalculable chance of gain; and a trade-gamble as a calculated greater than zero chance of gain.
No manhood to wave, and my balls are made of steel
Sal