Australian spelling vs nitre

Australian spelling and nitre both are nouns.

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

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