giveaway vs offertory

giveaway

noun
  • An event at which things are given away for free. 

  • The act of giving something away for free. 

  • An indicator that makes something obvious or apparent. 

  • Something that is given away or handed out for free. 

adj
  • free of charge, at no cost. 

  • very low. 

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. 

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