different between lusting vs rusting

English

lusting

lusting (plural lustings)

The act of one who lusts.
- 1851, J. Bradford Sax, The Organic Laws; Or, the Laws which Govern the Human Organism
  These depraved lustings after flesh, grease, narcotics, etc., are a disgrace to human nature; you ought to be ashamed of them, and eradicate and destroy them as soon as possible.

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.

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