accrual vs gathering

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. 

gathering

noun
  • A charitable contribution; a collection. 

  • A meeting or get-together; a party or social function. 

  • A group of people or things. 

  • A section, a group of bifolios, or sheets of paper, stacked together and folded in half. 

  • The collection of produce, items, goods, etc.; the practice of collecting food from nature. 

  • A tumor or boil suppurated or maturated; an abscess. 

adj
  • That gathers together. 

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