exhortation vs pep talk

exhortation and pep talk both are nouns.

Word	Noun	Adjective	Verb	Adverb
exhortation	Yes	No	No	No
pep talk	Yes	No	No	No

As nouns, pep talk is a hyponym of exhortation; that is, pep talk is a word with a more specific, narrower meaning than exhortation:

exhortation: the act of exhorting; an earnest attempt at persuasion
pep talk: a speech of exhortation attempting to instill enthusiasm and determination in a team or staff

exhortation (noun)	pep talk (noun)
the act of exhorting; an earnest attempt at persuasion	a speech of exhortation attempting to instill enthusiasm and determination in a team or staff
a communication intended to urge or persuade the recipients to take some action