haunting vs shocking

haunting

adj
  • Remaining in the mind; not easily forgotten. 

noun
  • A particular instance of haunting; a ghostly habitation. 

shocking

adj
  • Inspiring shock; startling. 

  • Unusually obscene or lewd. 

  • Extremely bad. 

noun
  • The application of an electric shock. 

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