harshness vs malevolency

harshness and malevolency both are nouns.

Word	Noun	Adjective	Verb	Adverb
harshness	Yes	No	No	No
malevolency	Yes	No	No	No

As nouns, malevolency is a hypernym of harshness; that is, malevolency is a word with a broader meaning than harshness:

Other hypernyms of harshness include malevolence, malice.

harshness (noun)	malevolency (noun)
the quality of being harsh or rough or grating to the senses	the quality of threatening evil
excessive sternness
the roughness of a substance that causes abrasions
the quality of being cruel and causing tension or annoyance