off-colour vs Australian spelling

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

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

off-colour (noun)	Australian spelling (noun)
	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')

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