misplacer
misaligner
misperceiver
misapplier
misstater
mislabeler
misdealer
misteacher
mislayer
misconceiver
belittler
misunderstander
misguider
misidentifier
misdescriber
misdirector
misconstruer
misjudger
discreditor
undeceiver
mismanager
mistruster
misreader
misbehaver
estranger
misinformer
misfirer
would lose one's head if it wasn't attached
misappropriator
unentangler
disinformer
disinformant
misrepresenter
dishonourer
misadventurer
mistaker
mishandler
misreporter
hider
misnamer
wronger
misspeaker
discommender
misleader
race mixer
underpredictor
misseller
eschewer
palooka
obscurant