mezzo-relievo vs relievo

mezzo-relievo and relievo both are nouns.

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

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

mezzo-relievo: a sculptural relief between low relief and high relief
relievo: sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background

Other hypernyms of mezzo-relievo include embossment, relief, rilievo, sculptural relief.

mezzo-relievo (noun)	relievo (noun)
a sculptural relief between low relief and high relief	sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background