bitter vs nightmare

bitter

verb
  • To make bitter. 

noun
  • A type of beer heavily flavored with hops. 

  • A liquid or powder, made from bitter herbs, used in mixed drinks or as a tonic. 

  • A turn of a cable about the bitts. 

  • A hardware system whose architecture is based around units of the specified number of bits (binary digits). 

adj
  • Having an acrid taste (usually from a basic substance). 

  • Harsh, piercing or stinging. 

  • Hateful or hostile. 

  • Cynical and resentful. 

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