shake vs shake up

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

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

As verbs, shake and shake up are synonyms defined as:

Other synonyms of shake include excite, stimulate, stir.

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

shake (noun)	shake up (noun)
a reflex motion caused by cold or fear or excitement
causing to move repeatedly from side to side
grasping and shaking a person's hand (as to acknowledge an introduction or to agree on a contract)
a note that alternates rapidly with another note a semitone above it
frothy drink of milk and flavoring and sometimes fruit or ice cream
building material used as siding or roofing

shake (verb)	shake up (verb)
move with or as if with a tremor	make fuller by shaking
undermine or cause to waver	change the arrangement or position of
bring to a specified condition by or as if by shaking	stir the feelings, emotions, or peace of
shake (a body part) to communicate a greeting, feeling, or cognitive state	shock physically
stir the feelings, emotions, or peace of	shake; especially (a patient to detect fluids or air in the body)
move or cause to move back and forth	organize anew
shake or vibrate rapidly and intensively
move back and forth or sideways
get rid of