Australian spelling vs overutilisation

Australian spelling and overutilisation both are nouns.

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

Australian spelling (noun)	overutilisation (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	exploitation to the point of diminishing returns