British spelling vs watercolour

British spelling and watercolour both are nouns.

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

British spelling (noun)	watercolour (noun)
English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')	the art or technique of painting with watercolors
	a painting produced with watercolors
	a water-base paint (with water-soluble pigments); used by artists
	water-soluble pigment

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