maximisation vs British spelling

maximisation and British spelling both are nouns.

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

maximisation (noun)	British spelling (noun)
the act of raising to the highest possible point or condition or position	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')