different between jettying vs jetting

English

jettying

jettying (uncountable)

A technique used in mediaeval timber-frame buildings in which an upper floor projects beyond the dimensions of the floor below.

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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