basso relievo vs basso rilievo

basso relievo and basso rilievo both are nouns.

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

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

basso relievo and basso rilievo: a sculptural relief in which forms extend only slightly from the background; no figures are undercut

Other synonyms of basso relievo include bas relief, low relief.

basso relievo (noun)	basso rilievo (noun)
a sculptural relief in which forms extend only slightly from the background; no figures are undercut	a sculptural relief in which forms extend only slightly from the background; no figures are undercut