externalisation vs British spelling

externalisation and British spelling both are nouns.

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

externalisation (noun)	British spelling (noun)
embodying in an outward form	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')
attributing to outside causes