alto relievo vs embossment

alto relievo and embossment both are nouns.

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

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

alto relievo: 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 relievo include relief, relievo, rilievo, sculptural relief.

alto relievo (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