different between thwock vs thwok

English

thwock

thwock (plural thwocks)

thwock (third-person singular simple present thwocks, present participle thwocking, simple past and past participle thwocked)

thwok

Alternative form of thock
- 1996, Alaska quarterly review, Volume 15
  The rock in my hand made a hearty thwok when it hit the meat of the tree.
- 2006, John Shannon, The Dark Streets: A Jack Liffey Mystery
  There was an irregular thwok-thwok from below, and balls sailed into sight and on into the far metal netting where they gave a faint rattle and plop...

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