deprecation vs dysphemism

deprecation

noun
  • An imprecation or curse. 

  • A praying against evil; prayer that an evil may be removed or prevented; strong expression of disapprobation. 

  • The act of deprecating. 

  • Entreaty for pardon; petitioning. 

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. 

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