hierarch vs kirkman

hierarch

noun
  • One who has high and controlling authority in sacred things; the chief of a sacred order. 

  • A title of bishops in their role as ordinaries (arbiters of canon law) over their respective dioceses. 

kirkman

noun
  • A clergyman or officer in a kirk. 

  • A member of the Church of Scotland. 

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