palpitation vs trembling

palpitation and trembling both are nouns.

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

As nouns, palpitation and trembling are synonyms defined as:

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

palpitation (noun)	trembling (noun)
a rapid and irregular heart beat	a shaky motion
a shaky motion

palpitation (adjective)	trembling (adjective)
	vibrating slightly and irregularly; as e.g. with fear or cold or like the leaves of an aspen in a breeze