yammer vs yawp

yammer

verb
  • To talk loudly and persistently. 

  • To complain peevishly. 

  • To repeat on and on, usually loudly or in complaint. 

  • To make an outcry; to clamor. 

noun
  • A loud noise. 

  • One who yammers. 

  • The act or noise of yammering. 

yawp

verb
  • to talk loudly and coarsely 

  • clamor, utter loud complaints 

  • to yelp, or utter a sharp cry, as in intense pain, or another raucous noise 

noun
  • loud or coarse talk 

  • a yelp or bark 

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