abuse, annoyance, annoying, disregard, exploitation, harassment, irritation, maltreatment, molestation, neglect, using, vexation, victimisation, victimization.
Your query has returned 1288 words, which include anagrams of mistreatments as well as other shorter words that can be made using the letters included in mistreatments.
The words in this list can be used in games such as Scrabble, Words with Friends, Wordscapes and other similar games.