glee vs gravity

glee

noun
  • Music; minstrelsy; entertainment. 

  • Joy; happiness; great delight, especially from one's own good fortune or from another's misfortune. 

  • An unaccompanied part song for three or more solo voices, not necessarily merry. 

verb
  • To sing a glee (unaccompanied part song). 

gravity

noun
  • The lowness of a note. 

  • The state or condition of being grave; seriousness. 

  • Specific gravity. 

  • The state or condition of having weight; weight; heaviness. 

  • Gravitation, the universal force exercised by two bodies onto each other. 

  • The force at the Earth's surface, of the attraction by the Earth's masses, and the centrifugal pseudo-force caused by the Earth's rotation, resulting from gravitation. 

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