Alto rilievo and Relievo

Alto rilievo noun - A sculptural relief in which forms extend out from the background to at least half their depth.

Relievo and alto rilievo are semantically related. In some cases you can use "Relievo" instead a noun phrase "Alto rilievo".

Relievo noun - Sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background.

Alto rilievo and relievo are semantically related. Sometimes you can replace phrase "Alto rilievo" with "Relievo", this terms are similar.