thresh vs yark

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. 

yark

verb
  • To hit, strike, especially with a cane or whip. 

  • To crack (a whip). 

  • To draw (stitches etc.) tight. 

  • To make ready; prepare. 

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