cliffhanger vs close call

cliffhanger

noun
  • An outcome which is awaited with keen anticipation, especially one which is delayed for a period of time or which is not known until the last minute. 

  • An ending or stopping point calculated to leave a story unresolved, in order to create suspense. 

close call

noun
  • A situation in which an injury or other undesirable outcome is narrowly avoided. 

  • A close brush with nuclear war. 

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