shakiness vs palpitation

shakiness and palpitation both are nouns.

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

As nouns, shakiness and palpitation are synonyms defined as:

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

shakiness (noun)	palpitation (noun)
the quality of being unstable and insecure	a rapid and irregular heart beat
a shaky motion	a shaky motion