British spelling vs arbour

British spelling and arbour both are nouns.

Word	Noun	Adjective	Verb	Adverb
British spelling	Yes	No	No	No
arbour	Yes	No	No	No

British spelling (noun)	arbour (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	a framework that supports climbing plants