Yes, RELIEVO is a Scrabble word!

Letter values in Scrabble US: R 1, E 1, L 1, I 1, E 1, V 4, O 1.

Is it a valid word?

RELIEVO is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

sculpture consisting of shapes carved on a surface so as to stand out from the surrounding background

Also: sculptural relief.