caw vs quack

caw

noun
  • The harsh cry of a crow. 

verb
  • To make the harsh cry of a crow, rook, or raven. 

intj
  • A rendering of the vocalisation of a crow or other corvid. 

quack

noun
  • The sound made by a duck. 

  • 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. 

  • 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. 

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