darkness vs illumination

darkness and illumination both are nouns.

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

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

darkness (noun)	illumination (noun)
a swarthy complexion	painting or drawing included in a book (especially in illuminated medieval manuscripts)
having a dark or somber color	the luminous flux incident on a unit area
an unenlightened state	an interpretation that removes obstacles to understanding
an unilluminated area	the degree of visibility of your environment
absence of light or illumination	a condition of spiritual awareness; divine illumination
absence of moral or spiritual values