soprano vs mezzo

soprano and mezzo both are nouns.

Word	Noun	Adjective	Verb	Adverb
soprano	Yes	Yes	No	No
mezzo	Yes	No	No	No

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

Other hyponyms of soprano include coloratura, coloratura soprano, mezzo-soprano.

soprano (noun)	mezzo (noun)
the pitch range of the highest female voice	the female singing voice between contralto and soprano
the highest female voice; the voice of a boy before puberty	a soprano with a voice between soprano and contralto
a female singer with the highest vocal range of all the voice type

soprano (adjective)	mezzo (adjective)
having or denoting a high range