megalomania vs obsessedness

megalomania

noun
  • An obsession with grandiose or extravagant things or actions. 

  • A psychopathological condition characterized by delusional fantasies of wealth, power, or omnipotence. 

obsessedness

noun
  • The quality of being obsessed; obsession. 

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