demigod vs diva

demigod

noun
  • Someone held up for reverence as a supreme example. 

  • A half-god or hero; the offspring of a deity and a mortal. 

diva

noun
  • A person who may be considered or who considers herself (or by extension himself) much more important than others, has high expectations of others and who is extremely demanding and fussy when it comes to personal privileges. 

  • Any female celebrity, usually a well known singer or actress. 

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