BW defence vs British spelling

BW defence and British spelling both are nouns.

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

BW defence (noun)	British spelling (noun)
defense against biological warfare	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')