base camp vs cantonment

base camp

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

cantonment

noun
  • A permanent military station. 

  • Temporary military living quarters. 

  • A town or village, or part of a town or village, assigned to a body of troops for quarters. 

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