calling card vs greeting card

calling card

noun
  • A small printed card which identifies the bearer, traditionally presented for introduction when making a social visit to a home or when attending a formal social event or business meeting. 

  • A card advertising the services of a prostitute. 

  • Excrement, especially of a domestic animal. 

  • An attribute, symptom, object, or behavior which is distinctly characteristic of someone or something. 

  • A phonecard. 

greeting card

noun
  • A card, typically folded in half and available commercially, that is sent to someone as a greeting. (This entry is a translation hub.) 

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