derogate vs slander

derogate

verb
  • To detract from (something); to disparage, belittle. 

  • To remove a part, to detract from (a quality of excellence, authority etc.). 

  • To act in a manner below oneself; to debase oneself. 

  • To take away (something from something else) in a way which leaves it lessened. 

slander

verb
  • To utter a slanderous statement about; baselessly speak ill of. 

  • To poke fun at a certain group of people 

noun
  • A collection of humorous videos intended to poke fun at a certain group of people, such as a community or nation 

  • A false or unsupported, malicious statement (spoken, not written), especially one which is injurious to a person's reputation; the making of such a statement. 

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