'Rush' in the Bible

Ah, the uproar of many peoples, who roar like the roaring of the seas; and the rushing of nations, that rush like the rushing of mighty waters!

The nations will rush like the rushing of many waters: but he will rebuke them, and they will flee far off, and will be chased like the chaff of the mountains before the wind, and like the whirling dust before the storm.

Neither shall there be for Egypt any work, which head or tail, palm branch or rush, may do.

Is such the fast that I have chosen? the day for a man to afflict his soul? Is it to bow down his head as a rush, and to spread sackcloth and ashes under him? Will you call this a fast, and an acceptable day to Yahweh?