bleat vs churr

bleat

verb
  • Of a sheep or goat, to make its characteristic cry; of a human, to mimic this sound. 

  • Of a person, to complain. 

noun
  • The characteristic cry of a sheep or a goat. 

churr

verb
  • To make the low vocal sound of some birds. 

noun
  • A low vocal sound made by some birds. 

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