curmudgeon vs grouch

curmudgeon

noun
  • An ill-tempered person full of stubborn ideas or opinions. 

grouch

noun
  • One who is grumpy or irritable. 

  • A complaint, a grumble, a fit of ill-humor. 

verb
  • To be grumpy or irritable; to complain. 

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