bullwhip vs sjambok

bullwhip

verb
  • To beat with a bullwhip. 

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

sjambok

verb
  • To whip with a sjambok; to horsewhip. 

noun
  • A stout whip, especially made of rhinoceros or hippopotamus hide. 

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