shake up vs scare

shake up is not a noun while scare is a noun.

Word	Noun	Adjective	Verb	Adverb
shake up	No	No	Yes	No
scare	Yes	No	Yes	No

As verbs, scare is a hyponym of shake up; that is, scare is a word with a more specific, narrower meaning than shake up:

shake up (noun)	scare (noun)
	a sudden attack of fear
	sudden mass fear and anxiety over anticipated events

shake up (verb)	scare (verb)
make fuller by shaking	cause fear in
change the arrangement or position of	cause to lose courage; to be daunted; to be scared away
stir the feelings, emotions, or peace of
shock physically
shake; especially (a patient to detect fluids or air in the body)
organize anew