off-colour vs British spelling

off-colour is not a noun while British spelling is a noun.

Word	Noun	Adjective	Verb	Adverb
off-colour	No	Yes	No	No
British spelling	Yes	No	No	No

off-colour (noun)	British spelling (noun)
	English orthography used in the UK, Ireland and most of the Commonwealth (characterized by 'analyse', 'centre' and 'useable')

off-colour (adjective)	British spelling (adjective)
in violation of good taste even verging on the indecent