different between chomping vs champing

English

chomping

chomping (plural chompings)

The sound or action of one who chomps.
- E. E. Cummings
  They had quite a layout, a regular picnic-lunch elaborate enough for kings or even presidents. The v-f-g in particular annoyed me by uttering alternate chompings and belchings.

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.

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