evil vs diabolical

evil is a noun but diabolical is not a noun.

Word	Noun	Adjective	Verb	Adverb
evil	Yes	Yes	No	No
diabolical	No	Yes	No	No

evil (noun)	diabolical (noun)
morally objectionable behavior
the quality of being morally wrong in principle or practice

evil (adjective)	diabolical (adjective)
morally bad or wrong	extremely evil or cruel; expressive of cruelty or befitting hell
having or exerting a malignant influence	showing the cunning or ingenuity or wickedness typical of a devil
having the nature of vice