mediaeval vs British spelling

mediaeval is not a noun while British spelling is a noun.

Word	Noun	Adjective	Verb	Adverb
mediaeval	No	Yes	No	No
British spelling	Yes	No	No	No

mediaeval (noun)	British spelling (noun)
	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')

mediaeval (adjective)	British spelling (adjective)
relating to or belonging to the Middle Ages
as if belonging to the Middle Ages; old-fashioned and unenlightened
characteristic of the time of chivalry and knighthood in the Middle Ages