British spelling vs burnt

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

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

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

British spelling (adjective)	burnt (adjective)
	ruined by overcooking
	destroyed or badly damaged by fire
	treated by heating to a high temperature but below the melting or fusing point