dead centre vs Canadian spelling

dead centre and Canadian spelling both are nouns.

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

dead centre (noun)	Canadian spelling (noun)
the position of a crank when it is in line with the connecting rod and not exerting torque	English orthography used in Canada (characterized by 'analyze', 'centre', 'useable')