ethnicity vs sept

ethnicity

noun
  • An ethnic group. 

  • The common characteristics of a group of people, especially regarding ancestry, culture, language or national experiences. 

  • Race; common ancestry. 

sept

noun
  • A clan, tribe, or family, proceeding from a common progenitor; especially, one of the ancient clans of Ireland. 

  • An enclosure; a railing. 

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