pep up vs jazz up

pep up and jazz up both are verbs.

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

As verbs, pep up and jazz up are synonyms defined as:

Other synonyms of pep up include ginger up, juice up.

pep up (verb)	jazz up (verb)
make more interesting or lively	make more interesting or lively
spur on or encourage especially by cheers and shouts