offertory vs souvenir

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. 

souvenir

noun
  • An item of sentimental value, that is given or kept to remember an event or location. 

verb
  • To take (something) as a souvenir, especially illicitly, for example during wartime. 

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