birthday card vs credit card

birthday card

noun
  • A greeting card given to someone to celebrate his or her birthday. 

credit card

noun
  • Any type of bank card. 

  • A plastic card, usually with a magnetic strip or an embedded microchip, connected to a credit account and used to buy goods or services. 

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