exhilaration vs unhappiness

exhilaration

noun
  • The state of being enlivened, cheerful or exhilarated. 

  • The act of enlivening the spirits; the act of making glad or cheerful; a gladdening. 

unhappiness

noun
  • The feeling of not being happy 

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