Wallboard (noun)

1. A type of construction material used to make walls, usually made of gypsum and pressed between two thick sheets of paper.
2. A type of drywall used to finish interior walls and ceilings.

Origin:

The word "wallboard" is a combination of "wall" and "board", meaning a type of board used for walls.

Examples:

1. The contractor suggested using wallboard instead of plaster for the remodel.
2. I had to patch a hole in the wallboard before painting.
3. The wallboard was easy to cut and install.
4. The wallboard was damaged by water leaks.
5. The wallboard was removed to expose brick behind it.