mugger vs racketeer

mugger

noun
  • A person who assaults and robs others, especially in a public place. 

  • A large crocodile, Crocodylus palustris, of southwest Asia, having a very broad wrinkled snout. 

  • A person who makes exaggerated faces, as a performance; a gurner. 

racketeer

noun
  • one who commits crimes (especially fraud, bribery, loansharking, extortion etc.) to aid in running a shady or illegal business. 

  • one who instigates or has involvement with a racket. 

verb
  • to commit crimes systematically as part of a criminal organization. 

  • to carry out illegal business activities or criminal schemes. 

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