cattle call vs hearing

cattle call

noun
  • An audition which is open to the public and thus draws a large number of applicants, many of whom are inexperienced. 

hearing

adj
  • Able to hear, as opposed to deaf. 

noun
  • The sense used to perceive sound. 

  • A proceeding at which discussions are heard. 

  • The act by which something is heard. 

  • A legal procedure done before a judge, without a jury, as with an evidentiary hearing. 

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