Answer: harasser

AnswerCrossword Clue
HARASSERBully
HARASSERVexer
HARASSERNag
HARASSERPersistent annoyer
HARASSERMolester
HARASSERMore than a pest
HARASSERTormentor
HARASSERPesky sort
HARASSERStalker, for one
harasserto attack repeatedly
harasserone who harasses (to bother persistently)
harasserto disturb persistently