Gambling has either a specific economic definition or general definition that does not include money.
The most popular types of gambling are casino games, poker, sports betting - All are games that include wagering money with the primary intent of winning more money. But in fact we have much more gambling in our lives that are part of daily decisions we take.
Some speculative investment activities like FOREX are usually not defined as part of gambling despite the risky nature, but here we do consider them as gambling due to the growing number speculators entering this market.