brutality vs cruelty

brutality and cruelty both are nouns.

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

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

Other hypernyms of brutality include cruelness, harshness.

brutality (noun)	cruelty (noun)
a brutal barbarous savage act	a cruel act; a deliberate infliction of pain and suffering
the trait of extreme cruelty	the quality of being cruel and causing tension or annoyance
	feelings of extreme heartlessness