bullwhip vs yerk

bullwhip

verb
  • To beat with a bullwhip. 

noun
  • A whip made from plaited leather, often with a knotted end, for use with livestock. 

yerk

verb
  • To throw or thrust with a sudden, smart movement; to kick or strike suddenly; to jerk. 

  • To bind or tie with a jerk. 

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