deferment vs holdoff

deferment

noun
  • An act or instance of deferring or putting off. 

  • Officially sanctioned postponement of compulsory military service. 

holdoff

noun
  • A delay or forebearance. 

  • A fixture or attachment intended to prevent direct contact between two objects. 

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