deferment vs moratorium

deferment

noun
  • Officially sanctioned postponement of compulsory military service. 

  • An act or instance of deferring or putting off. 

moratorium

noun
  • An authorization to a debtor, permitting temporary suspension of payments. 

  • A suspension of an ongoing activity. 

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