fright vs spook

fright

noun
  • A state of terror excited by the sudden appearance of danger; sudden and violent fear, usually of short duration; a sudden alarm. 

  • Someone strange, ugly or shocking, producing a feeling of alarm or aversion. 

adj
  • frightened; afraid; affright 

spook

noun
  • A scare or fright. 

  • A ghost or phantom. 

  • An undercover agent or spy. 

  • A hobgoblin. 

  • A psychiatrist. 

  • A player who engages in hole carding by attempting to glimpse the dealer's hole card when the dealer checks under an ace or a 10 to see if a blackjack is present. 

  • A metaphysical manifestation; an artificial distinction or construct. 

verb
  • To frighten or make nervous (especially by startling). 

  • To become frightened (by something startling). 

  • To haunt. 

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