rakshasa vs succubus

rakshasa

noun
  • A member of a race of mythical fanged demons that eat human flesh and blood, somewhat like vampires. 

succubus

noun
  • A female demon which comes to men, especially monks, in their dreams to seduce them and have sexual intercourse, drawing energy from the men to sustain themselves, often until the point of exhaustion or death. 

  • A strumpet, whore or prostitute. 

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