ecstasy vs felicity

ecstasy

noun
  • Intense pleasure. 

  • A trance, frenzy, or rapture associated with mystic or prophetic exaltation. 

  • The drug MDMA, a synthetic entactogen of the methylenedioxyphenethylamine family, especially in a tablet form. 

  • A state of emotion so intense that a person is carried beyond rational thought and self-control. 

verb
  • To experience intense pleasure. 

  • To cause intense pleasure in. 

felicity

noun
  • Happiness; (countable) an instance of this. 

  • Something that is either a source of happiness or particularly apt. 

  • An apt and pleasing style in speech, writing, etc.; (countable) an apt and pleasing choice of words. 

  • Reproduction of a sign with fidelity. 

  • Good luck; success; (countable) An instance of unexpected good luck; a stroke of luck; also, a lucky characteristic. 

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