progeny vs sept

progeny

noun
  • Offspring or descendants considered as a group. 

  • A result of a creative effort. 

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 progeny and sept occurred in a corpus of books? (source: Google Ngram Viewer )