opsonisation vs British spelling

opsonisation and British spelling both are nouns.

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

opsonisation (noun)	British spelling (noun)
process whereby opsonins make an invading microorganism more susceptible to phagocytosis	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')