clangour vs clank

clangour

verb
  • To make a clanging sound. 

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

clank

verb
  • To make a clanking sound 

  • To cause to sound with a clank. 

noun
  • A loud, hard sound of metal hitting metal. 

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