rapper vs vocalist

rapper and vocalist both are nouns.

Word	Noun	Adjective	Verb	Adverb
rapper	Yes	No	No	No
vocalist	Yes	No	No	No

As nouns, vocalist is a hypernym of rapper; that is, vocalist is a word with a broader meaning than rapper:

Other hypernyms of rapper include singer, vocaliser, vocalizer.

rapper (noun)	vocalist (noun)
a device (usually metal and ornamental) attached by a hinge to a door	a person who sings
someone who performs rap music