desensitisation vs British spelling

desensitisation and British spelling both are nouns.

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

desensitisation (noun)	British spelling (noun)
the process of reducing sensitivity	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')