pilotage vs primacy

pilotage

noun
  • The occupation of a pilot. 

  • The use of landmarks to guide a vessel or aircraft to its destination. 

  • The fee paid to a pilot. 

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 pilotage and primacy occurred in a corpus of books? (source: Google Ngram Viewer )