Australian English spelling vs Australian English orthography

Australian English spelling and Australian English orthography both are nouns.

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

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

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

Other synonyms of Australian English spelling include Australian spelling.

Australian English 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')