cliffhanger vs shocker

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. 

shocker

noun
  • One who or that which shocks or startles. 

  • A device for giving electric shocks. 

  • Synonym of stooker. 

  • A particular hand gesture with a sexual connotation. 

  • Something done really badly. 

  • Sexual act related to the shocker hand gesture: two in the pink, one in the stink. 

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