base camp vs refuge

base camp

noun
  • An encampment used temporarily for storing supplies and preparing for a larger activity, such as mountain climbing or hunting. 

refuge

noun
  • A place providing safety, protection or shelter. 

  • A state of safety, protection or shelter. 

  • A refuge island. 

  • An expedient to secure protection or defence. 

  • Something or someone turned to for safety or assistance; a recourse or resort. 

verb
  • To return to a place of shelter. 

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