Alto relievo and Rilievo

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

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

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

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