buccaneer vs robber

buccaneer

noun
  • A pirate. 

  • Any of a group of seamen who cruised on their own account on the Spanish Main and in the Pacific in the 17th century, who were similar to pirates but did not prey on ships of their own nation. 

verb
  • To engage in piracy against any but one's own nation's ships. 

robber

noun
  • A person who robs. 

  • An animal who robs. 

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