calling card vs joker

calling card

noun
  • A card advertising the services of a prostitute. 

  • Excrement, especially of a domestic animal. 

  • 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. 

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

  • A phonecard. 

joker

noun
  • A playing card that features a picture of a joker (that is, a jester) and that may be used as a wild card in some card games. 

  • A funny person. 

  • An unspecified, vaguely disreputable person. 

  • A friendly unit that acts as a suspected hostile unit in a military excercise. 

  • A jester. 

  • A person who makes jokes. 

  • A clause in a contract that undermines its apparent provisions. 

  • A man. 

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