lullaby vs vocal

lullaby and vocal both are nouns.

Word	Noun	Adjective	Verb	Adverb
lullaby	Yes	No	No	No
vocal	Yes	Yes	No	No

As nouns, vocal is a hypernym of lullaby; that is, vocal is a word with a broader meaning than lullaby:

Other hypernyms of lullaby include song.

lullaby (noun)	vocal (noun)
the act of singing a quiet song to lull a child to sleep	music intended to be performed by one or more singers, usually with instrumental accompaniment
a quiet song intended to lull a child to sleep	a short musical composition with words

lullaby (adjective)	vocal (adjective)
	having or using the power to produce speech or sound
	relating to or designed for or using the singing voice
	given to expressing yourself freely or insistently
	full of the sound of voices