atrocity vs obscenity

atrocity

noun
  • The quality or state of being atrocious; enormous wickedness; extreme criminality or cruelty. 

  • An extremely cruel act; a horrid act of injustice. 

  • An object considered to be extremely unattractive or undesirable. 

obscenity

noun
  • The qualities that make something obscene; lewdness, indecency, or offensive behaviour. 

  • Specifically, an offensive word; a profanity; a dirty word. 

  • An act of obscene behaviour. 

  • Something that is obscene. 

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