parson vs pontiff

parson

noun
  • A Roman Catholic priest of an independent parish church. 

  • A Protestant minister. 

  • An Anglican cleric having full legal control of a parish under ecclesiastical law; a rector. 

pontiff

noun
  • A bishop of the early Church; now specifically, the Pope. 

  • Any chief figure or leader of a religion. 

  • A member of the most illustrious of the colleges of priests of the Roman religion, the College of Pontiffs; a pontifex. 

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