nitre vs Australian spelling

nitre and Australian spelling both are nouns.

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

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