brutality vs harshness

brutality and harshness both are nouns.

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

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

Other hypernyms of brutality include cruelness, cruelty.

brutality (noun)	harshness (noun)
a brutal barbarous savage act	the quality of being harsh or rough or grating to the senses
the trait of extreme cruelty	excessive sternness
	the roughness of a substance that causes abrasions
	the quality of being cruel and causing tension or annoyance