ill-treatment vs maltreatment

ill-treatment and maltreatment both are nouns.

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

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

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

ill-treatment (noun)	maltreatment (noun)
cruel or inhumane treatment	cruel or inhumane treatment