mezzo-rilievo vs rilievo

mezzo-rilievo and rilievo both are nouns.

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

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

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

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

mezzo-rilievo (noun)	rilievo (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