joke vs sobriety

joke

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

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

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. 

sobriety

noun
  • Soundness of judgement. 

  • The state or quality of being unhurried; a state of calm. 

  • The quality or state of being grave or earnestly thoughtful. 

  • A state of moderation or seriousness. 

  • The quality or state of not being intoxicated. 

  • Modesty in color or style. 

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