catheterisation vs British spelling

catheterisation and British spelling both are nouns.

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

catheterisation (noun)	British spelling (noun)
the operation of introducing a catheter into the body	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')