Dervish vs anchorite

Dervish

noun
  • A citizen or inhabitant of Darawiish (circa 1895–1920 C.E.), the Dhulbahante anti-colonial polity geographically corresponding with Khaatumo. 

  • A member of a Sufi Muslim ascetic fraternity of mendicant friars. 

anchorite

noun
  • One who lives in isolation or seclusion, especially for religious reasons; hermit. 

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