conceptualisation vs British spelling

conceptualisation and British spelling both are nouns.

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

conceptualisation (noun)	British spelling (noun)
inventing or contriving an idea or explanation and formulating it mentally	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')
an elaborated concept