clangour vs vociferance

clangour

noun

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

verb

  • To make a clanging sound. 

vociferance

noun

  • Vociferation; clamour, noise. 

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