churr vs halloo

churr

noun
  • A low vocal sound made by some birds. 

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

halloo

noun
  • A shout of halloo. 

intj
  • Used to greet someone, or to catch their attention. 

  • Used in hunting to urge on the pursuers. 

verb
  • To shout halloo. 

  • To encourage with shouts; to egg (someone) on. 

  • To shout (something). 

  • To chase with shouts or outcries. 

  • To call or shout to; to hail. 

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