pep up vs encourage

pep up and encourage both are verbs.

Word	Noun	Adjective	Verb	Adverb
pep up	No	No	Yes	No
encourage	No	No	Yes	No

As verbs, encourage is a hypernym of pep up; that is, encourage is a word with a broader meaning than pep up:

pep up (verb)	encourage (verb)
make more interesting or lively	spur on
spur on or encourage especially by cheers and shouts	inspire with confidence; give hope or courage to
	contribute to the progress or growth of