culpability vs incubus

culpability

noun
  • The degree of one's blameworthiness in the commission of a crime or offence. 

incubus

noun
  • Any oppressive thing or person; a burden. 

  • An evil spirit supposed to oppress people while asleep, especially to have sex with women as they sleep. 

  • One of various of parasitic insects, especially subfamily Aphidiinae. 

  • A feeling of oppression during sleep, sleep paralysis; night terrors, a nightmare. 

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