Water-resistant drywall or "greenboard" has the same gypsum core as drywall, but it has a water-resistant facing. It is typically used in wet areas such as a bathtub or shower surround. It's not water-proof, however, and will deteriorate from moisture penetration.

Concrete backerboard, often called by the brand names "Durock" and "Wonder Board", is used as backing for ceramic tile. It has a solid concrete core and is faced on both sides with fiberglass. It's ideal for wet areas like shower walls and bathtub surrounds.