pasteurisation vs British spelling

pasteurisation and British spelling both are nouns.

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

pasteurisation (noun)	British spelling (noun)
partial sterilization of foods at a temperature that destroys harmful microorganisms without major changes in the chemistry of the food	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')