shakiness vs quivering

shakiness and quivering both are nouns.

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

As nouns, shakiness and quivering are synonyms defined as:

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

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