different between rusting vs borning

English

rusting

rusting (plural rustings)

The development of rust on a surface.
- 1899, Scientific American (volume 81, page 309)
  An example will best make the matter clear, and throw light, perhaps, on many cases of apparently mysterious rustings.

borning

borning (not comparable)

In the process of being born.
- 1967, William Styron, The Confessions of Nat Turner, Vintage 2004, p. 332:
  While yanking a borning calf from its mother's womb Moore suffered a bizarre and fatal accident: the cord arted abruptly, sending my owner in a sprawl backward until his head fetched up against a post and cracked open like a melon.

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