archpriest vs ecclesiast

archpriest

noun
  • An honorific title applied to a priest who has a specific function. 

  • The highest rank given to a married priest. 

ecclesiast

noun
  • A cleric; someone (such as a priest) who administers a church (ecclesia) or other religious gathering/group. 

  • A member of the Athenian ecclesia (public legislative assembly). 

  • A member of any ecclesia (church or other assembly). 

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