sceptical vs Australian spelling

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

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

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

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