British spelling vs externalisation

British spelling and externalisation both are nouns.

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

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