archimandrite vs hegumen

archimandrite

noun
  • The superior of a large monastery, or group of monasteries, in the Orthodox Church. 

  • An honorary title sometimes given to a monastic priest. 

hegumen

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

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