Australian spelling vs burnt

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

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

Australian spelling (noun)	burnt (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')

Australian 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