sombre vs Australian spelling

sombre is not a noun while Australian spelling is a noun.

Word	Noun	Adjective	Verb	Adverb
sombre	No	Yes	No	No
Australian spelling	Yes	No	No	No

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

sombre (adjective)	Australian spelling (adjective)
lacking brightness or color; dull
grave or even gloomy in character