flooding vs nightmare

flooding

noun
  • Emotional overwhelm sometimes leading to a primal state of rage or panic. 

  • A form of therapy that treats a phobia by suddenly exposing the patient to the object of the phobia, instead of approaching it gradually. 

  • An act of flooding; a flood or gush. 

nightmare

noun
  • Any bad, miserable, difficult or terrifying situation or experience that arouses anxiety, terror, agony or great displeasure. 

  • A very bad or frightening dream. 

  • A feeling of extreme anxiety or suffocation experienced during sleep; Sleep paralysis. 

verb
  • To have a nightmare. 

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