Australian spelling vs overspecialise

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

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

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

Australian spelling (verb)	overspecialise (verb)
	become overly specialized