depreciative vs dysphemism

depreciative

noun

  • A statement with a tendency to deprecate. 

adj

  • Tending to depreciate (in value etc.) 

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