The word Mistretment is misspelled against Mistreatment, a noun meaning "Wrong treatment."
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Mistreatment has vowels 'ea' together mispronounced as 'e'
Word contains consecutive vowels 'EA' in between alphabets mistr & tment is misspelled as 'E'
Wrong Spelling:  mistr-e-tment 
Correct Spelling:  mistr-ea-tment 
Find more wrongly spelled words of Mistreatment to spell it well.