baa vs birdcall

baa

verb
  • To make the characteristic cry of a sheep. 

noun
  • The characteristic cry or bleating of a sheep. 

  • The letter ب in the Arabic script. 

intj
  • The characteristic cry of a sheep. 

birdcall

verb
  • To imitate the cry of a bird. 

noun
  • Any vocalisation of a bird. 

  • An imitation of this cry. 

  • A device used to imitate this cry, so as to lure and catch birds. 

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