chain armour vs British spelling

chain armour and British spelling both are nouns.

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

chain armour (noun)	British spelling (noun)
(Middle Ages) flexible armor made of interlinked metal rings	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')