fever vs nightmare

fever

noun
  • A state of excitement or anxiety. 

  • A higher than normal body temperature of a person (or, generally, a mammal), usually caused by disease. 

  • A group of stingrays. 

  • Any of various diseases. 

verb
  • To become fevered. 

  • To put into a fever; to affect with fever. 

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 fever and nightmare occurred in a corpus of books? (source: Google Ngram Viewer )