Australian spelling vs overgeneralise

Australian spelling is a noun but overgeneralise is not a noun.

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

Australian spelling (noun)	overgeneralise (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')

Australian spelling (verb)	overgeneralise (verb)
	draw too general a conclusion