hydrophobia vs insanity

hydrophobia

noun
  • A morbid fear of water; aquaphobia. 

  • An aversion to water, as a symptom of rabies; the disease of rabies itself. 

insanity

noun
  • The state of being insane; madness. 

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