shakeup vs shake up

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

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

shakeup (noun)	shake up (noun)
the imposition of a new organization; organizing differently (often involving extensive and drastic changes)

shakeup (verb)	shake up (verb)
	make fuller by shaking
	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