alto relievo vs alto rilievo

alto relievo and alto rilievo both are nouns.

Word	Noun	Adjective	Verb	Adverb
alto relievo	Yes	No	No	No
alto rilievo	Yes	No	No	No

As nouns, alto relievo and alto rilievo are synonyms defined as:

alto relievo and alto rilievo: a sculptural relief in which forms extend out from the background to at least half their depth

Other synonyms of alto relievo include high relief.

alto relievo (noun)	alto rilievo (noun)
a sculptural relief in which forms extend out from the background to at least half their depth	a sculptural relief in which forms extend out from the background to at least half their depth