shakiness vs shaking

shakiness and shaking both are nouns.

Word	Noun	Adjective	Verb	Adverb
shakiness	Yes	No	No	No
shaking	Yes	No	No	No

As nouns, shakiness and shaking are synonyms defined as:

Other synonyms of shakiness include palpitation, quiver, quivering, trembling, vibration.

shakiness (noun)	shaking (noun)
the quality of being unstable and insecure	the act of causing something to move up and down (or back and forth) with quick movements
a shaky motion	a shaky motion