dysphemism vs execration

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. 

execration

noun
  • An act or instance of cursing; a curse dictated by violent feelings of hatred; an imprecation; an expression of utter detestation. 

  • That which is execrated; a detested thing. 

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