lights-out vs dark

lights-out and dark both are nouns.

Word	Noun	Adjective	Verb	Adverb
lights-out	Yes	No	No	No
dark	Yes	Yes	No	No

lights-out (noun)	dark (noun)
(military) signal to turn the lights out	an unenlightened state
a prescribed bedtime	an unilluminated area
	absence of light or illumination
	absence of moral or spiritual values
	the time after sunset and before sunrise while it is dark outside

lights-out (adjective)	dark (adjective)
	devoid of or deficient in light or brightness; shadowed or black
	(used of color) having a dark hue
	brunet (used of hair or skin or eyes)
	secret
	causing dejection
	stemming from evil characteristics or forces; wicked or dishonorable
	showing a brooding ill humor
	not giving performances; closed
	marked by difficulty of style or expression
	lacking enlightenment or knowledge or culture