waul vs yawp

waul

verb
  • To wail, to cry plaintively. 

yawp

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

  • clamor, utter loud complaints 

  • to talk loudly and coarsely 

noun
  • loud or coarse talk 

  • a yelp or bark 

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