isomerisation vs Australian spelling

isomerisation and Australian spelling both are nouns.

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

isomerisation (noun)	Australian spelling (noun)
the conversion of a compound into an isomer of itself	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')