scare vs shake up

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

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

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

Other hypernyms of scare include excite, shake, stimulate, stir.

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

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