caper vs coup de théâtre

caper

noun
  • A playful leap or jump. 

  • Playful behaviour. 

  • The pungent grayish green flower bud of the European and Oriental caper (Capparis spinosa), which is pickled and eaten. 

  • The capercaillie. 

  • A crime, especially an elaborate heist, or a narrative about such a crime. 

  • A vessel formerly used by the Dutch; privateer. 

  • A plant of the genus Capparis. 

  • A jump while dancing. 

  • A prank or practical joke. 

verb
  • To jump as part of a dance. 

  • To engage in playful behaviour. 

  • To leap or jump about in a sprightly or playful manner. 

coup de théâtre

noun
  • A theatrical trick or gesture, something staged for dramatic effect. 

  • A sudden or unexpected event in a play, pulled off by the author, the director, or even an actor. 

How often have the words caper and coup de théâtre occurred in a corpus of books? (source: Google Ngram Viewer )