Noun
wallboard (countable and uncountable, plural wallboards)
A construction material of pre-made boards used for walls and ceilings, usually a gypsum core with a paper surface.
Ground mica The leading use of dry-ground mica in the US is in joint compound for filling and finishing seams and blemishes in gypsum wallboard ( drywall ). Source: Internet
Peanut shells are used in the manufacture of plastic, wallboard, abrasives, fuel, cellulose (used in rayon and paper), and mucilage (glue). Source: Internet