rhetoric vs sermon

rhetoric

noun
  • The art of using language, especially public speaking, as a means to persuade. 

  • Meaningless language with an exaggerated style intended to impress. 

adj
  • Synonym of rhetorical. 

sermon

noun
  • A lengthy speech of reproval. 

  • Religious discourse; a written or spoken address on a religious or moral matter. 

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