counterfeit vs quack

counterfeit

noun
  • One who counterfeits; a counterfeiter. 

  • A non-genuine article; a fake. 

adj
  • Inauthentic. 

  • False, especially of money; intended to deceive or carry appearance of being genuine. 

  • Assuming the appearance of something; deceitful; hypocritical. 

verb
  • To falsely produce what appears to be official or valid; to produce a forged copy of. 

  • Of a turn or river card, to invalidate a player's hand by making a better hand on the board. 

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. 

adj
  • Falsely presented as having medicinal powers. 

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). 

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