black humour vs Australian spelling

black humour and Australian spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
black humour	Yes	No	No	No
Australian spelling	Yes	No	No	No

black humour (noun)	Australian spelling (noun)
the juxtaposition of morbid and farcical elements (in writing or drama) to give a disturbing effect	English orthography used in Australia (characterized by 'analyse', 'centre', 'usable')