sachem vs seigneur

sachem

noun
  • A boss, a leader. 

  • A chief of one or several Native American tribe(s), especially of the Algonquians; a sagamore. 

  • A high-ranking officer of the Tammany Hall political organization. 

seigneur

noun
  • A feudal lord or noble in French contexts. 

  • The hereditary feudal ruler of Sark. 

  • A landowner in Canada; the holder of a seigneurie. 

  • A hereditary title in the Bailiwick of Jersey. 

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