anchoress vs dervish

anchoress

noun
  • An anchorwoman. 

  • A female anchorite. A woman who chooses to withdraw from the world to live a solitary life of prayer and contemplation. 

dervish

noun
  • Any irregular guerrilla fighter resembling the Sudanese Mahdi in equipment, uniform, tactics, etc. 

  • A citizen or inhabitant of Darawiish (circa 1895–1920 C.E.), an anti-colonial polity in modern Somalia headed by Sufis. 

  • One of the followers of Muhammad Ahmad, the Mahdi of the Sudan, in the 1880s. 

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