naturalisation vs British spelling

naturalisation and British spelling both are nouns.

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

naturalisation (noun)	British spelling (noun)
the proceeding whereby a foreigner is granted citizenship	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')
changing the pronunciation of a borrowed word to agree with the borrowers' phonology
the introduction of animals or plants to places where they flourish but are not indigenous
the quality of being brought into conformity with nature