natural fibre vs Australian spelling

natural fibre and Australian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
natural fibre	Yes	No	No	No
Australian spelling	Yes	No	No	No

natural fibre (noun)	Australian spelling (noun)
fiber derived from plants or animals	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')