child abuse vs ill-treatment

child abuse and ill-treatment both are nouns.

Word	Noun	Adjective	Verb	Adverb
child abuse	Yes	No	No	No
ill-treatment	Yes	No	No	No

As nouns, ill-treatment is a hypernym of child abuse; that is, ill-treatment is a word with a broader meaning than child abuse:

Other hypernyms of child abuse include abuse, ill-usage, maltreatment.

child abuse (noun)	ill-treatment (noun)
the physical or emotional or sexual mistreatment of children	cruel or inhumane treatment