different between champing vs cramping

English

champing

champing (plural champings)

The sound or action of one who champs.
- 1906, Jack London, The White Man's Way
  When I passed them each a plate of the fried meat, they ate greedily, making loud mouth-noises — champings of worn teeth and sucking intakes of the breath, accompanied by a continuous spluttering and mumbling.

cramping

cramping (plural crampings)

The action of something that cramps.
- 1867, Eclectic Medical Society of the State of New York, Transactions
  There are also twitchings or crampings of the muscles to a greater or less extent — which, if not relieved, soon become general and exceedingly violent and painful.

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