self-fertilisation vs Australian spelling

self-fertilisation and Australian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
self-fertilisation	Yes	No	No	No
Australian spelling	Yes	No	No	No

self-fertilisation (noun)	Australian spelling (noun)
fertilization by the union of male and female gametes from the same individual	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')