Australian spelling vs line of defence

Australian spelling and line of defence both are nouns.

Word	Noun	Adjective	Verb	Adverb
Australian spelling	Yes	No	No	No
line of defence	Yes	No	No	No

Australian spelling (noun)	line of defence (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	defensive structure consisting of a barrier that can be employed for defense against attack
	any organization whose responsibility it is to defend against something