different between thwacking vs thacking

English

thwacking

thwacking (plural thwackings)

The action or sound of a thwack; a beating.
- 1907, W. Jenkyn Thomas, The Welsh Fairy Book
  The next day he realised that, glorious as his hiding place was as an escape from books and thwackings, it had its disadvantages: the chief was that there was nothing to eat and drink, and that is a very serious thing for a growing boy […]

thacking

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