deferral vs inactivity

deferral

noun
  • An act of deferring, a deferment. 

  • An accrual. 

  • A prepayment. 

inactivity

noun
  • The quality of being inactive; idleness; passiveness. 

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