orthopaedic vs Australian spelling

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

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

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

orthopaedic (adjective)	Australian spelling (adjective)
of or relating to orthopedics