Australian spelling vs saltpetre

Australian spelling and saltpetre both are nouns.

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

Australian spelling (noun)	saltpetre (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	(KNO3) used especially as a fertilizer and explosive