randomisation vs British spelling

randomisation and British spelling both are nouns.

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

randomisation (noun)	British spelling (noun)
a deliberately haphazard arrangement of observations so as to simulate chance	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')