Australian spelling vs dead centre

Australian spelling and dead centre both are nouns.

Word	Noun	Adjective	Verb	Adverb
Australian spelling	Yes	No	No	No
dead centre	Yes	No	No	No

Australian spelling (noun)	dead centre (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	the position of a crank when it is in line with the connecting rod and not exerting torque