hilarity vs mirth

hilarity

noun
  • Something that induces laughter. 

  • A great amount of amusement, usually accompanied by laughter. 

mirth

noun
  • The emotion usually following humour and accompanied by laughter; merriment; jollity; gaiety. 

  • That which causes merriment. 

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