lightlessness vs darkness

lightlessness and darkness both are nouns.

Word	Noun	Adjective	Verb	Adverb
lightlessness	Yes	No	No	No
darkness	Yes	No	No	No

As nouns, darkness is a hypernym of lightlessness; that is, darkness is a word with a broader meaning than lightlessness:

Other hypernyms of lightlessness include dark.

lightlessness (noun)	darkness (noun)
total absence of light	a swarthy complexion
	having a dark or somber color
	an unenlightened state
	an unilluminated area
	absence of light or illumination
	absence of moral or spiritual values