tremor vs shaking

tremor and shaking both are nouns.

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

As nouns, shaking is a hypernym of tremor; that is, shaking is a word with a broader meaning than tremor:

tremor: shaking or trembling (usually resulting from weakness or stress or disease)
shaking: a shaky motion

Other hypernyms of tremor include palpitation, quiver, quivering, shakiness, trembling, vibration.

tremor (noun)	shaking (noun)
an involuntary vibration (as if from illness or fear)	the act of causing something to move up and down (or back and forth) with quick movements
a small earthquake	a shaky motion
shaking or trembling (usually resulting from weakness or stress or disease)

tremor (verb)	shaking (verb)
shake with seismic vibrations