dry wall vs fibreboard

dry wall and fibreboard both are nouns.

Word	Noun	Adjective	Verb	Adverb
dry wall	Yes	No	No	No
fibreboard	Yes	No	No	No

As nouns, fibreboard is a hyponym of dry wall; that is, fibreboard is a word with a more specific, narrower meaning than dry wall:

dry wall: 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
fibreboard: wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets

Other hyponyms of dry wall include beaver board, fiberboard, particle board, gypsum board, plasterboard.

dry wall (noun)	fibreboard (noun)
a stone wall made with stones fitted together without mortar	wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets
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