dysphemism vs obscenity

dysphemism

noun
  • The use of a word or phrase carrying negative connotations or imagery (especially one that is derogatory, offensive or vulgar) to replace a (more) neutral original. 

  • A word or phrase that is used to replace another in this way. 

obscenity

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

  • An act of obscene behaviour. 

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

  • Something that is obscene. 

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