accrual vs bonus

accrual

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

  • 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. 

bonus

noun
  • Something extra that is good; an added benefit. 

  • An extra sum given as a premium, e.g. to an employee or to a shareholder. 

  • An addition to the player's score based on performance, e.g. for time remaining. 

  • One or more free throws awarded to a team when the opposing team has accumulated enough fouls. 

verb
  • To pay a bonus, premium 

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