It depends on which type of trade you're in, actually lot of skills required to get success in trading. Partially we can accept that the trading as gambling because along with skills and knowledge luck matters in trading. Once if anybody tastes success while trading by sheer luck they can term it as gambling.
Generally the fact is that many traders belong to gambling as well as their direct occupation. Reality of trade can also bring aesthetic pleasure and passion from the fact that you are at risk.
As for me trading is different from gambling for my reason that trading requires skills, technique and strategy in order to succeed and gain more profit,.but
for gambling the techniques and strategy is unreliable for the sure win its all because gambling is unpredictable may they have similarity only that they both involve risk but not at the same weight.