sombre vs sober

sombre and sober both are adjectives.

Word	Noun	Adjective	Verb	Adverb
sombre	No	Yes	No	No
sober	No	Yes	Yes	No

As adjectives, sombre and sober are synonyms defined as:

Other synonyms of sombre include drab, somber.

sombre (adjective)	sober (adjective)
lacking brightness or color; dull	not affected by a chemical substance (especially alcohol)
grave or even gloomy in character	completely lacking in playfulness
	lacking brightness or color; dull
	dignified and somber in manner or character and committed to keeping promises

sombre (verb)	sober (verb)
	become sober after excessive alcohol consumption
	become more realistic
	cause to become sober