philtre vs Australian spelling

philtre and Australian spelling both are nouns.

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

philtre (noun)	Australian spelling (noun)
a drink credited with magical power; can make the one who takes it love the one who gave it	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')