coo vs drone

coo

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

  • An expression of pleasure made by a person. 

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

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

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

adj
  • Cool. 

drone

noun
  • A humming or deep murmuring sound. 

  • One of the fixed-pitch pipes on a bagpipe. 

  • One who performs menial or tedious work. 

  • A person without the ability to think critically and independently, especially one who follows a group blindly; a non-player character. 

  • A remotely controlled aircraft, an unmanned aerial vehicle (UAV). 

  • A Toyota HiAce or a similar van, especially one used by Ugandan state agents to kidnap opposition members. 

  • A male ant, bee or wasp, which does not work but can fertilize the queen. 

  • A genre of music that uses repeated lengthy droning sounds. 

  • A low-pitched hum or buzz. 

verb
  • To speak in a monotone way. 

  • To produce a low-pitched hum or buzz. 

  • To kill with a missile fired by unmanned aircraft. 

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