ill-treat vs abuse

ill-treat is not a noun while abuse is a noun.

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

As verbs, ill-treat and abuse are synonyms defined as:

Other synonyms of ill-treat include ill-use, maltreat, mistreat, step.

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

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