That's correct, in general trading is more like a job compared to gambling because if we are talking about job, we have to put a lot of time and effort in order to do it well and will generate a good result. However, in gambling even if we spend a lot of time and effort, we still cannot get our ultimate goal which is to be consistent in making money, therefore we have to fully choose where to invest our time and money and surely it's not gambling.
To be honest with you, both are not really a job. Trading should not be considered a job as it has no fixed time of working just like the other work and someone could stop trading anytime they want. Gambling on the other hand is pretty much the same so both are ways of making money however I wont really consider both as a job