joy vs melancholia

joy

noun
  • A feeling of extreme happiness or cheerfulness, especially related to the acquisition or expectation of something good. 

  • Anything that causes such a feeling. 

  • Luck or success; a positive outcome. 

verb
  • To feel joy, to rejoice. 

melancholia

noun
  • Deep sadness or gloom; melancholy 

  • depression, characterised by irrational fears, guilt and apathy 

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