liven up vs perk up

liven up and perk up both are verbs.

Word	Noun	Adjective	Verb	Adverb
liven up	No	No	Yes	No
perk up	No	No	Yes	No

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

Other hypernyms of liven up include arouse, brace, energise, energize, stimulate.

liven up (verb)	perk up (verb)
make lively	gain or regain energy
	cause to be alert and energetic