nerve centre vs Australian spelling

nerve centre and Australian spelling both are nouns.

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

nerve centre (noun)	Australian spelling (noun)
a cluster of nerve cells governing a specific bodily process	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')
a center that provides information and control