tremor vs shakiness

tremor and shakiness both are nouns.

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

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

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

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

tremor (noun)	shakiness (noun)
an involuntary vibration (as if from illness or fear)	the quality of being unstable and insecure
a small earthquake	a shaky motion
shaking or trembling (usually resulting from weakness or stress or disease)

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