nightmare vs scowl

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. 

scowl

verb
  • To express by a scowl. 

  • To wrinkle the brows, as in frowning or displeasure; to put on a frowning look; to look sour, sullen, severe, or angry. 

  • To look at or repel with a scowl or a frown. 

  • To look gloomy, dark, or threatening; to lower. 

noun
  • The wrinkling of the brows or face in frowning; the expression of displeasure, sullenness, or discontent in the countenance; an angry frown. 

  • Gloom; dark or threatening aspect. 

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