Australian spelling vs Australian English orthography

Australian spelling and Australian English orthography both are nouns.

Word	Noun	Adjective	Verb	Adverb
Australian spelling	Yes	No	No	No
Australian English orthography	Yes	No	No	No

As nouns, Australian spelling and Australian English orthography are synonyms defined as:

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

Other synonyms of Australian spelling include Australian English spelling.

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