clangour vs shrill

clangour

verb
  • To make a clanging sound. 

noun
  • A loud, repeating clanging sound; a loud racket; a din. 

shrill

verb
  • To make a shrill noise. 

adj
  • Sharp or keen to the senses. 

  • Having a shrill voice. 

  • Fierce, loud, strident. 

  • High-pitched and piercing. 

noun
  • A shrill sound. 

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