Dervish vs hikikomori

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. 

hikikomori

noun
  • A reclusive person of this kind. 

  • A Japanese phenomenon whereby an individual becomes a recluse from society, typically remaining isolated in a single room at home for a very long period. 

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