drywall vs plasterboard

drywall and plasterboard both are nouns.

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

As nouns, plasterboard is a hyponym of drywall; that is, plasterboard is a word with a more specific, narrower meaning than drywall:

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
plasterboard: wallboard with a gypsum plaster core bonded to layers of paper or fiberboard; used instead of plaster or wallboard to make interior walls

Other hyponyms of drywall include beaver board, fiberboard, fibreboard, particle board, gypsum board.

drywall (noun)	plasterboard (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	wallboard with a gypsum plaster core bonded to layers of paper or fiberboard; used instead of plaster or wallboard to make interior walls