Four Horsemen vs evilness

Four Horsemen and evilness both are nouns.

Word	Noun	Adjective	Verb	Adverb
Four Horsemen	Yes	No	No	No
evilness	Yes	No	No	No

As nouns, evilness is a hypernym of Four Horsemen; that is, evilness is a word with a broader meaning than Four Horsemen:

Four Horsemen: (New Testament) the four evils that will come at the end of the world: conquest rides a white horse; war a red horse; famine a black horse; plague a pale horse
evilness: the quality of being morally wrong in principle or practice

Other hypernyms of Four Horsemen include evil.

Four Horsemen (noun)	evilness (noun)
(New Testament) the four evils that will come at the end of the world: conquest rides a white horse; war a red horse; famine a black horse; plague a pale horse	the quality of being morally wrong in principle or practice