roop vs waul

roop

verb

  • To cry; shout. 

  • To roar; make a great noise. 

  • To make hoarse. 

noun

  • Hoarseness. 

waul

verb

  • To wail, to cry plaintively. 

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