mow vs nightmare

mow

verb
  • To make grimaces, mock. 

  • To cut down grass or crops. 

  • To cut down or slaughter in great numbers. 

  • To put into mows. 

noun
  • A scornful grimace; a wry face. 

  • A stack of hay, corn, beans or a barn for the storage of hay, corn, beans. 

  • The place in a barn where hay or grain in the sheaf is stowed. 

  • The act of mowing (a garden, grass, etc.). 

  • A shot played with a sweeping or scythe-like motion. 

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