ethnarch vs theocrat

ethnarch

noun
  • A leader of an ethnic community, especially a Jewish or (in the Ottoman Empire) Eastern Orthodox leader having political as well as spiritual authority. 

  • The governor of a Jewish province under the Roman Empire. 

theocrat

noun
  • The ruler of a theocracy, a priest-king. 

  • A proponent of theocracy. 

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