drywall vs wallboard

drywall and wallboard both are nouns.

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

As nouns, drywall and wallboard are synonyms defined as:

drywall and wallboard: 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 drywall include dry wall.

drywall (noun)	wallboard (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