thresh vs whank

thresh

verb
  • To beat soundly, usually with some tool such as a stick or whip; to drub. 

  • To violently toss the limbs about. 

  • To separate the grain from the straw or husks (chaff) by mechanical beating, with a flail or machinery. 

whank

verb
  • To beat; to thrash; to whip; to lash. 

  • To cut, especially to cut off a large portion. 

noun
  • A strike with the fist; a blow; a knock. 

  • A large portion, slice or lump. 

How often have the words thresh and whank occurred in a corpus of books? (source: Google Ngram Viewer )