quivering vs shakiness

quivering and shakiness both are nouns.

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

As nouns, quivering and shakiness are synonyms defined as:

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

quivering (noun)	shakiness (noun)
the act of vibrating	the quality of being unstable and insecure
a shaky motion	a shaky motion