churchman vs theologus

churchman

noun
  • A person (originally a man) of authority in a religious organization; a cleric. 

  • A member or adherent of an established church, especially the Church of England. 

theologus

noun
  • Synonym of theologian (“Roman Catholic lecturer”) 

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