dread vs nightmare

dread

verb
  • To be in dread, or great fear. 

  • To style (the hair) into dreadlocks. 

  • To fear greatly. 

  • To anticipate with fear. 

adj
  • Terrible; greatly feared; dreaded. 

noun
  • A Rastafarian. 

  • Great fear in view of impending evil; fearful apprehension of danger; anticipatory terror. 

  • Somebody or something dreaded. 

  • Reverential or respectful fear; awe. 

nightmare

verb
  • To have a 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. 

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