offertory vs write-off

offertory

noun
  • The part of the Eucharist service when offerings of bread and wine are placed on the altar and when any collection is taken; also, the money or other things collected. 

  • A linen or silken cloth anciently used in various ceremonies connected with the administration of the Eucharist. 

  • A prayer said or sung as an anthem while offerings of bread and wine are placed on the altar during the Roman Catholic Mass or the Anglican Communion service. 

write-off

noun
  • The cancellation of an item; the amount cancelled or lost 

  • Something that is now worthless (such as a car after an accident) 

How often have the words offertory and write-off occurred in a corpus of books? (source: Google Ngram Viewer )