misaligner
misperceiver
misapplier
misplacer
mislabeler
misstater
misconstruer
misdealer
mislayer
misdescriber
misunderstander
misidentifier
misreader
misteacher
misconceiver
misbehaver
misguider
belittler
misdirector
misspeaker
misreporter
mismanager
misjudger
misrepresenter
misinformer
misappropriator
obscurant
misfirer
miseducator
would lose one's head if it wasn't attached
mispronouncer
dishonourer
mishandler
discreditor
discommender
undeceiver
misnamer
mishearer
noncomprehender
confounder
misshaper
underpredictor
disinformant
foister
disinformer
deludee
refounder
contorter
inciter
distortionist