inhuman treatment vs cruelty

inhuman treatment and cruelty both are nouns.

Word	Noun	Adjective	Verb	Adverb
inhuman treatment	Yes	No	No	No
cruelty	Yes	No	No	No

As nouns, inhuman treatment and cruelty are synonyms defined as:

inhuman treatment and cruelty: a cruel act; a deliberate infliction of pain and suffering

inhuman treatment (noun)	cruelty (noun)
a cruel act; a deliberate infliction of pain and suffering	a cruel act; a deliberate infliction of pain and suffering
	the quality of being cruel and causing tension or annoyance
	feelings of extreme heartlessness