fun vs joke

fun

verb
  • To tease, kid, poke fun at, make fun of. 

noun
  • playful, often noisy, activity. 

  • amusement, enjoyment or pleasure 

adj
  • Enjoyable or amusing. 

  • Whimsical or flamboyant. 

joke

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

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

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. 

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