Drywall and Gypsum board

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.

Gypsum board and drywall are semantically related In some cases you can replace phrase "Gypsum board" with "Drywall", this terms are similar.

Gypsum board noun - Wallboard with a gypsum plaster core bonded to layers of paper or fiberboard; used instead of plaster or wallboard to make interior walls.

Drywall and gypsum board are semantically related in wall material topic. You can use "Drywall" instead a noun phrase "Gypsum board".