14:4 king of Babylon. Isaiah 14:4-23—in fact, all of chapters 13 and 14—predict the ultimate fall of Babylon at a time even before the kingdom of Babylon became dominant. In Isaiah’s time, the Assyrian empire was the leading nation.
14:7 at rest. There has never been a year since Isaiah’s time that the whole earth was at rest. This prophecy can never be fulfilled until at the return of Christ when Babylon and all it stands for are destroyed.
14:8 feller. That is, one who cuts down trees.