detraction vs dysphemism

detraction

noun
  • A derogatory or malicious statement; a disparagement, misrepresentation or slander. 

  • The act of detracting something, or something detracted; taking away; diminution. 

  • The act of revealing previously unknown faults of another person to a third person. 

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 detraction and dysphemism occurred in a corpus of books? (source: Google Ngram Viewer )