self-realisation vs British spelling

self-realisation and British spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-realisation	Yes	No	No	No
British spelling	Yes	No	No	No

self-realisation (noun)	British spelling (noun)
the fulfillment of your capacities	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')