chaplain vs hegumen

chaplain

noun
  • A member of a religious body who is (often, although not always, of the clergy) officially assigned to provide pastoral care at an institution, group, private chapel, etc. 

  • A person without religious affiliation who carries out similar duties in a secular context. 

hegumen

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

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