buccaneering vs freebooting

buccaneering

noun
  • robbery on the high seas; piracy 

adj
  • bold, reckless and unscrupulous 

freebooting

noun
  • Piracy or plundering. 

  • Software piracy, or stealing or unauthorized rehosting of digital content. 

adj
  • Engaged in piracy or plunder 

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