ill-treatment vs abuse

ill-treatment and abuse both are nouns.

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

As nouns, ill-treatment and abuse are synonyms defined as:

Other synonyms of ill-treatment include ill-usage, maltreatment.

ill-treatment (noun)	abuse (noun)
cruel or inhumane treatment	improper or excessive use
	cruel or inhumane treatment
	a rude expression intended to offend or hurt

ill-treatment (verb)	abuse (verb)
	change the inherent purpose or function of something
	use wrongly or improperly or excessively
	use foul or abusive language towards
	treat badly