scepticism vs Australian spelling

scepticism and Australian spelling both are nouns.

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

scepticism (noun)	Australian spelling (noun)
the disbelief in any claims of ultimate knowledge	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')
doubt about the truth of something