mezzo-soprano vs soprano

mezzo-soprano and soprano both are nouns.

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

As nouns, soprano is a hypernym of mezzo-soprano; that is, soprano is a word with a broader meaning than mezzo-soprano:

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

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