shake up vs frighten

shake up and frighten both are verbs.

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

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

shake up (verb)	frighten (verb)
make fuller by shaking	cause fear in
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