shaking vs trembling

shaking and trembling both are nouns.

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

As nouns, shaking and trembling are synonyms defined as:

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

shaking (noun)	trembling (noun)
the act of causing something to move up and down (or back and forth) with quick movements	a shaky motion
a shaky motion

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