accrual vs payment

accrual

noun
  • from the creditor's viewpoint, a charge incurred in one accounting period that has not been, but is to be, paid by the end of it. 

  • An increase; something that accumulates, especially an amount of money that periodically accumulates for a specific purpose 

payment

noun
  • The act of paying. 

  • An instance of that act; a sum of money paid in exchange for goods or services, or the transaction that conveys it. 

  • Antonyms: non-payment, nonpayment 

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