Dervish vs stylite

Dervish

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

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

stylite

noun
  • A Christian ascetic in ancient times who lived alone on top of a tall pillar. 

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