biodefence vs Australian spelling

biodefence and Australian spelling both are nouns.

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

biodefence (noun)	Australian spelling (noun)
procedures involved in taking defensive measures against attacks using biological agents	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')