chain armour vs Australian spelling

chain armour and Australian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
chain armour	Yes	No	No	No
Australian spelling	Yes	No	No	No

chain armour (noun)	Australian spelling (noun)
(Middle Ages) flexible armor made of interlinked metal rings	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')