wallboard vs drywall

wallboard and drywall both are nouns.

Word	Noun	Adjective	Verb	Adverb
wallboard	Yes	No	No	No
drywall	Yes	No	No	No

As nouns, wallboard and drywall are synonyms defined as:

wallboard and drywall: 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

Other synonyms of wallboard include dry wall.

wallboard (noun)	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	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