biodefence vs British spelling

biodefence and British spelling both are nouns.

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

biodefence (noun)	British spelling (noun)
procedures involved in taking defensive measures against attacks using biological agents	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')