tremolo vs shaking

tremolo and shaking both are nouns.

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

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

tremolo: (music) a tremulous effect produced by rapid repetition of a single tone or rapid alternation of two tones
shaking: a shaky motion

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

tremolo (noun)	shaking (noun)
vocal vibrato especially an excessive or poorly controlled one	the act of causing something to move up and down (or back and forth) with quick movements
(music) a tremulous effect produced by rapid repetition of a single tone or rapid alternation of two tones	a shaky motion