Nouns

(n)undoera seducer who ruins a woman“she awoke in the arms of her cruel undoer”
(n)undoer, opener, unfastener, untiera person who unfastens or unwraps or opens“children are talented undoers of their shoelaces”
(n)destroyer, ruiner, undoer, waster, uprootera person who destroys or ruins or lays waste to“a destroyer of the environment”, “jealousy was his undoer”, “uprooters of gravestones”