declamation vs protreptic

declamation

noun
  • The public recitation of speeches as an exercise in schools and colleges. 

  • The act or art of declaiming; rhetorical delivery; loud speaking in public. 

  • Pretentious rhetorical display, with more sound than sense. 

  • A set or harangue; declamatory discourse. 

protreptic

noun
  • A didactic speech, book, etc. 

adj
  • Serving to instruct; didactic. 

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