bullwhip vs horsewhip

bullwhip

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

verb
  • To beat with a bullwhip. 

horsewhip

noun
  • A whip for use on horses. 

verb
  • To flog or lash with a horsewhip. 

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