churr vs creak

churr

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

noun
  • A low vocal sound made by some birds. 

creak

verb
  • To produce a creaking sound with. 

  • To make a prolonged sharp grating or squeaking sound, as by the friction of hard substances. 

  • To suffer from strain or old age. 

noun
  • The sound produced by anything that creaks; a creaking. 

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