atomisation vs British spelling

atomisation and British spelling both are nouns.

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

atomisation (noun)	British spelling (noun)
separating something into fine particles	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')
annihilation by reducing something to atoms