British spelling vs square kilometre

British spelling and square kilometre both are nouns.

Word	Noun	Adjective	Verb	Adverb
British spelling	Yes	No	No	No
square kilometre	Yes	No	No	No

British spelling (noun)	square kilometre (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	a decimal multiple of the unit of surface area, the square metre, equal to 1,000,000 square meters.