Canadian French vs usherdom

Canadian French

noun

  • French Canadians, collectively. 

adj

  • French Canadian. 

name

  • The French language as spoken by francophones in Canada. 

usherdom

noun

  • Ushers, collectively. 

  • The office or position of an usher. 

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