different between roiling vs rowling

English

roiling

roiling (plural roilings)

The motion of something that roils; a bubbling or seething.
- 2011, Norman Spinrad, The Void Captain's Tale
  Truth be told with hindsight's vision, these musings were no doubt the externalization of the roilings and bubblings beginning to stir the deeper waters of my own being.

rowling

(archaic) present participle of roll
- 1667, John Milton, Paradise Lost, Book 1, lines 670–1:
  There stood a Hill not far whose griesly top / Belch'd fire and rowling smoak

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