alto rilievo vs embossment

alto rilievo and embossment both are nouns.

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

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

alto rilievo: a sculptural relief in which forms extend out from the background to at least half their depth
embossment: sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background

Other hypernyms of alto rilievo include relief, relievo, rilievo, sculptural relief.

alto rilievo (noun)	embossment (noun)
a sculptural relief in which forms extend out from the background to at least half their depth	sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background
	an impression produced by pressure or printing