squawk vs yell

squawk

verb
  • To make a squawking noise; to yell, scream, or call out shrilly. 

  • To produce a warning message, indicating a possible error. 

  • To set or transmit a four-digit transponder code. (Normally followed by the specific code in question.) 

  • To report an infraction; to rat on or tattle; to disclose a secret. 

  • To speak out; to protest. 

noun
  • A complaint or objection. 

  • A four-digit transponder code used by aircraft for identification or transmission of emergency signals. 

  • A warning message indicating a possible error. 

  • An issue or complaint related to aircraft maintenance. 

  • The American night heron. 

  • A shrill noise, especially made by a voice or bird; a yell, scream, or call. 

yell

verb
  • To shout; holler; make a loud sound with the voice. 

  • To tell someone off in a loud and angry manner. 

  • To convey by shouting. 

noun
  • A phrase to be shouted. 

  • A shout. 

adj
  • dry (of cow) 

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