swarthiness vs darkness

swarthiness and darkness both are nouns.

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

As nouns, swarthiness and darkness are synonyms defined as:

Other synonyms of swarthiness include duskiness.

swarthiness (noun)	darkness (noun)
a swarthy complexion	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