Australian spelling vs sceptical

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

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

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

Australian spelling (adjective)	sceptical (adjective)
	marked by or given to doubt
	denying or questioning the tenets of especially a religion