watercolour vs Canadian spelling

watercolour and Canadian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
watercolour	Yes	No	Yes	No
Canadian spelling	Yes	No	No	No

watercolour (noun)	Canadian spelling (noun)
the art or technique of painting with watercolors	English orthography used in Canada (characterized by 'analyze', 'centre', 'useable')
a painting produced with watercolors
a water-base paint (with water-soluble pigments); used by artists
water-soluble pigment

watercolour (verb)	Canadian spelling (verb)
paint with watercolors