opsonisation vs Australian spelling

opsonisation and Australian spelling both are nouns.

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

opsonisation (noun)	Australian spelling (noun)
process whereby opsonins make an invading microorganism more susceptible to phagocytosis	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')