diss vs dysphemism

diss

noun
  • An insult or put-down; an expression of disrespect. 

  • Dissertation. 

  • Ampelodesmos mauritanicus syn. Ampelodesmos tenax, a reedy grass used for cordage. 

verb
  • To put (someone) down, or show disrespect by the use of insulting language or dismissive behaviour. 

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