overemphasise vs Australian spelling

overemphasise is not a noun while Australian spelling is a noun.

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

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

overemphasise (verb)	Australian spelling (verb)
place special or excessive emphasis on