joke vs spoof

joke

noun
  • An amusing story. 

  • The root cause or main issue, especially an unexpected one 

  • A laughably worthless thing or person; a sham. 

  • Something that is far easier or far less challenging than expected. 

  • Something said or done for amusement, not in seriousness. 

verb
  • To do or say something for amusement rather than seriously. 

  • To dupe in a friendly manner for amusement; to mess with, play with. 

spoof

noun
  • An act of deception; a hoax; a joking prank. 

  • A drinking game in which players hold up to three (or another specified number of) coins hidden in a fist and attempt to guess the total number of coins held. 

  • A light parody. 

  • Nonsense. 

  • Semen. 

adj
  • Fake, hoax. 

verb
  • To falsify. 

  • To gently satirize. 

  • To ejaculate, to come. 

  • To deceive. 

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