laughing vs melancholy

laughing

noun

  • The action of the verb to laugh. 

melancholy

adj

  • Affected with great sadness or depression. 

noun

  • Great sadness or depression, especially of a thoughtful or introspective nature. 

  • Black bile, formerly thought to be one of the four "cardinal humours" of animal bodies. 

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