scramble vs shake up

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

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

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

Other hypernyms of scramble include agitate, commove, disturb, raise up, stir up, vex.

scramble (noun)	shake up (noun)
rushing about hastily in an undignified way
an unceremonious and disorganized struggle

scramble (verb)	shake up (verb)
make unintelligible	make fuller by shaking
bring into random order	change the arrangement or position of
stir vigorously	stir the feelings, emotions, or peace of
to move hurriedly	shock physically
climb awkwardly, as if by scrambling	shake; especially (a patient to detect fluids or air in the body)
	organize anew