skin colour vs Canadian spelling

skin colour and Canadian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
skin colour	Yes	No	No	No
Canadian spelling	Yes	No	No	No

skin colour (noun)	Canadian spelling (noun)
the coloring of a person's face	English orthography used in Canada (characterized by 'analyze', 'centre', 'useable')