shake up vs shakeup

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

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

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

shake up (verb)	shakeup (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