Canadian spelling vs call centre

Canadian spelling and call centre both are nouns.

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

Canadian spelling (noun)	call centre (noun)
English orthography used in Canada (characterized by 'analyze', 'centre', 'useable')	a center equipped to handle a large volume of telephone calls (especially for taking orders or serving customers)