Australian spelling vs call centre

Australian spelling and call centre both are nouns.

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

Australian spelling (noun)	call centre (noun)
English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')	a center equipped to handle a large volume of telephone calls (especially for taking orders or serving customers)