quack vs racketeer

quack

noun
  • A fraudulent healer, especially a bombastic peddler in worthless treatments, a doctor who makes false diagnoses for monetary benefit, or an untrained or poorly trained doctor who uses fraudulent credentials to attract patients 

  • Any similar charlatan or incompetent professional. 

  • The sound made by a duck. 

  • Any doctor. 

verb
  • To make a noise like a duck. 

  • Of a queen bee: to make a high-pitched sound during certain stages of development. 

  • To practice or commit quackery (fraudulent medicine). 

adj
  • Falsely presented as having medicinal powers. 

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 quack and racketeer occurred in a corpus of books? (source: Google Ngram Viewer )