bruit vs rumour

bruit

noun
  • An abnormal sound in the body heard on auscultation (for example, through using a stethoscope); a murmur. 

rumour

verb
  • Commonwealth standard spelling of rumor. 

noun
  • Britain, Canada, New Zealand, Australia, and Ireland spelling of rumor 

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