deferral vs discontinuation

deferral

noun
  • An act of deferring, a deferment. 

  • An accrual. 

  • A prepayment. 

discontinuation

noun
  • The act of stopping producing or supplying a product. 

  • The process of quitting a course of treatment with a drug. 

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