vibrato vs tremolo

vibrato and tremolo both are nouns.

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

As nouns, tremolo is a hyponym of vibrato; that is, tremolo is a word with a more specific, narrower meaning than vibrato:

vibrato: (music) a pulsating effect in an instrumental or vocal tone produced by slight and rapid variations in pitch
tremolo: vocal vibrato especially an excessive or poorly controlled one

vibrato (noun)	tremolo (noun)
(music) a pulsating effect in an instrumental or vocal tone produced by slight and rapid variations in pitch	vocal vibrato especially an excessive or poorly controlled one
	(music) a tremulous effect produced by rapid repetition of a single tone or rapid alternation of two tones