Drywall and Dry wall

Drywall noun - A wide flat board used to cover walls or partitions; made from plaster or wood pulp or other materials and used primarily to form the interior walls of houses.

Dry wall is a synonym for drywall. In some cases you can use "Dry wall" instead a noun "Drywall".

Dry wall noun - A wide flat board used to cover walls or partitions; made from plaster or wood pulp or other materials and used primarily to form the interior walls of houses.

Drywall is a synonym for dry wall. You can use "Drywall" instead a noun phrase "Dry wall".