roop vs roup

roop

verb
  • To cry; shout. 

  • To roar; make a great noise. 

  • To make hoarse. 

noun
  • Hoarseness. 

roup

verb
  • To cry or shout. 

  • To sell by auction. 

noun
  • An outcry. 

  • An infectious disease of poultry caused by Trichomonas gallinae. 

  • A sale of goods by auction. 

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