British spelling vs spelling

British spelling and spelling both are nouns.

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

As nouns, spelling is a hypernym of British spelling; that is, spelling is a word with a broader meaning than British spelling:

British spelling: English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')
spelling: forming words with letters according to the principles underlying accepted usage

British spelling (noun)	spelling (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	forming words with letters according to the principles underlying accepted usage