discourtesy vs flattery

discourtesy

noun
  • Lack of courtesy; rudeness. 

  • A rude act. 

flattery

noun
  • An instance of excessive praise. 

  • Excessive praise or approval, which is often insincere and sometimes contrived to win favour. 

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