high relief vs alto rilievo

high relief and alto rilievo both are nouns.

Word	Noun	Adjective	Verb	Adverb
high relief	Yes	No	No	No
alto rilievo	Yes	No	No	No

As nouns, high relief and alto rilievo are synonyms defined as:

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

Other synonyms of high relief include alto relievo.

high relief (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