hegumen vs pastor

hegumen

noun
  • The head of a monastery of the Eastern Orthodox Church or Eastern Catholic Churches. 

pastor

noun
  • The main priest serving a parish. 

  • A minister or priest in a church. 

  • Someone with spiritual authority over a group of people 

  • A bird, the rosy starling. 

verb
  • To serve a congregation as pastor 

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