somber vs American spelling

somber is not a noun while American spelling is a noun.

Word	Noun	Adjective	Verb	Adverb
somber	No	Yes	No	No
American spelling	Yes	No	No	No

somber (noun)	American spelling (noun)
	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

somber (adjective)	American spelling (adjective)
lacking brightness or color; dull
grave or even gloomy in character