different between weltering vs waltering

English

weltering

weltering (plural welterings)

The motion of something that welters; a billowing.
- 1854, Hugh Miller, The Two Records: The Mosaic and the Geological
  They may have extended, it is said, over only a few provinces of Central Asia, in which, when all was life and light in other parts of the globe, there reigned for a time only death and darkness amid the welterings of a chaotic sea […]

waltering

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