gypsum board vs plasterboard

gypsum board and plasterboard both are nouns.

Word	Noun	Adjective	Verb	Adverb
gypsum board	Yes	No	No	No
plasterboard	Yes	No	No	No

As nouns, gypsum board and plasterboard are synonyms defined as:

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

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