coo vs quack

coo

noun
  • The murmuring sound made by a dove or pigeon. 

  • An expression of pleasure made by a person. 

adj
  • Cool. 

verb
  • To speak in an admiring fashion, to be enthusiastic about. 

  • To make a soft murmuring sound, as a pigeon. 

intj
  • An expression of approval, fright, surprise, etc. 

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