different between jesting vs jetting

English

jesting (countable and uncountable, plural jestings)

joking
- 1599, William Shakespeare, The Passionate Pilgrim
  Yet in the midst of all her pure protestings, / Her faith, her oaths, her tears and all were jestings.
bantering; ridicule
mocking

jesting (comparative more jesting, superlative most jesting)

jesting

jetting

jetting (countable and uncountable, plural jettings)

The application of a jet of liquid, especially to treat livestock against pests.
- 1947, Agricultural Gazette of New South Wales (volume 57, page 589)
  In bad fly years more than five jettings may be needed. But whatever the conditions, except for rare waves of body-strike, while flies are active station labour can control them by working at jetting for about ten days per month.

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