bronco-buster vs buckaroo

bronco-buster

buckaroo

noun
  • A cowboy; specifically, a working cowboy who generally does not partake in rodeos. 

  • A reckless, headstrong person. 

  • One who sports a distinctive buckaroo style of cowboy clothing, boots, and heritage. 

  • A dollar; a buck. 

  • A style of cowboy boot with a high and uniquely tapered heel. 

How often have the words bronco-buster and buckaroo occurred in a corpus of books? (source: Google Ngram Viewer )