mezzo vs mezzo-soprano

mezzo and mezzo-soprano both are nouns.

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

As nouns, mezzo and mezzo-soprano are synonyms defined as:

mezzo and mezzo-soprano: the female singing voice between contralto and soprano

As nouns, mezzo and mezzo-soprano are synonyms defined as:

mezzo and mezzo-soprano: a soprano with a voice between soprano and contralto

mezzo (noun)	mezzo-soprano (noun)
the female singing voice between contralto and soprano	the female singing voice between contralto and soprano
a soprano with a voice between soprano and contralto	a soprano with a voice between soprano and contralto