humorousness vs play on

humorousness

noun
  • The result or product of being humorous. 

  • The state or quality of being humorous. 

play on

verb
  • to hit the ball into his own wicket, thus being out bowled 

  • Used other than figuratively or idiomatically: see play, on. 

  • to let the game continue after a foul has been committed, because the situation is advantageous to the team who would be awarded a foul. 

  • To exploit by exacerbating. 

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