harshness vs brutality

harshness and brutality both are nouns.

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

As nouns, brutality is a hyponym of harshness; that is, brutality is a word with a more specific, narrower meaning than harshness:

Other hyponyms of harshness include ferociousness, savagery, viciousness, murderousness.

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