calling card vs fool

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. 

fool

noun
  • A particular card in a tarot deck, representing a jester. 

  • A type of dessert made of puréed fruit and custard or cream. 

  • A jester; a person whose role was to entertain a sovereign and the court (or lower personages). 

  • A person with poor judgment or little intelligence. 

  • Someone who derives pleasure from something specified. 

  • Buddy, dude, man. 

adj
  • Foolish. 

verb
  • To act in an idiotic manner; to act foolishly. 

  • To trick; to deceive. 

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