bzz vs coo

bzz

verb
  • To make a buzzing sound like that of a bee or wasp. 

intj
  • The buzzing sound of a bee, wasp, etc. 

coo

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

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

adj
  • Cool. 

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

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

  • An expression of pleasure made by a person. 

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