overlordship vs primacy

overlordship

noun
  • The position or quality of being an overlord. 

  • The realm of overlords. 

primacy

noun
  • the office or dignity of an archbishop 

  • The state or condition of being prime or first, as in time, place, rank, etc. 

  • The office, rank, or character of a primate, it being the chief ecclesiastical station or dignity in a national church 

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