plasterboard vs gypsum board

plasterboard and gypsum board both are nouns.

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

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

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

plasterboard (noun)	gypsum board (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