tremolo vs vibration

tremolo and vibration both are nouns.

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

As nouns, vibration is a hypernym of tremolo; that is, vibration 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
vibration: a shaky motion

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

tremolo (noun)	vibration (noun)
vocal vibrato especially an excessive or poorly controlled one	the act of vibrating
(music) a tremulous effect produced by rapid repetition of a single tone or rapid alternation of two tones	a distinctive emotional aura experienced instinctively
	(physics) a regular periodic variation in value about a mean
	a shaky motion