Australian spelling vs fossilisation

Australian spelling and fossilisation both are nouns.

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

Australian spelling (noun)	fossilisation (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	becoming inflexible or out of date
	the process of fossilizing a plant or animal that existed in some earlier age; the process of being turned to stone