British spelling vs spoilt

British spelling is a noun but spoilt is not a noun.

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

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

British spelling (adjective)	spoilt (adjective)
	affected by blight; anything that mars or prevents growth or prosperity
	having the character or disposition harmed by pampering or oversolicitous attention
	(of foodstuffs) not in an edible or usable condition