1) Brand of drywall 2) Drywall brand 3) Gypsum board 4) Kind of plasterboard 5) Plasterboard 6) Plasterboard type 
Panels made primarily from gypsum installed over the framing to form the interior walls and ceilings. Sheetrock is often called gypsum board. 
[n] - (trademark) a kind of plasterboard
noun a kind of plasterboard