longing vs nympholepsy

longing

noun
  • An earnest and deep, not greatly passionate, but rather melancholic desire. 

  • The buying of a financial instrument with the expectation that its value will rise 

nympholepsy

noun
  • A frenzied state of (usually erotic) emotion, especially concerning something or someone unattainable. 

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