'Successor' in the Bible

Next, I decided to consider wisdom, as well as foolish behavior and ideas. For what more can the king's successor do than what the king has already done?

So I loathed all the fruit of my effort, for which I worked so hard on earth, because I must leave it behind in the hands of my successor.

I considered all the living who walk on earth, as well as the successor who would arise in his place.