fibreboard vs fiberboard

fibreboard and fiberboard both are nouns.

Word	Noun	Adjective	Verb	Adverb
fibreboard	Yes	No	No	No
fiberboard	Yes	No	No	No

As nouns, fibreboard and fiberboard are synonyms defined as:

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

Other synonyms of fibreboard include particle board.

fibreboard (noun)	fiberboard (noun)
wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets	wallboard composed of wood chips or shavings bonded together with resin and compressed into rigid sheets