mezzo-soprano vs mezzo

mezzo-soprano and mezzo both are nouns.

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

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

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

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

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

mezzo-soprano (noun)	mezzo (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