exhortation vs pep talk

exhortation

noun
  • The act or practice of exhorting; the act of inciting to laudable deeds; incitement to that which is good or commendable. 

  • Language intended to incite and encourage 

pep talk

noun
  • A rallying speech made to instill enthusiasm and boost confidence 

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