There are event you can predict on that even though it's not 💯 guaranteed that you're going to win, a level of certainty makes you think that you're surely going to win.
The downside of that feeling is that you might become over confident to use a big amount in the game since you're to a large extent certain that you're going to win.
Can we still say we are gambling if the event is something we are at least 90% sure that we are going to win?
Here's the thing, no matter how sure you think an option is in gambling there's still a possibility that this can turn against your prediction that you think is hundred percent accurate. This is a game of probability, things change within a second and minute, so to answer your question, yes it is still gambling. Just because you are sure of it doesn't actually mean that you can't end up losing. Gambling is very tricky