misuser
One who mishandles
A misuser is someone who uses something wrongly, improperly, or for unintended purposes.
The term appears most often in legal and policy contexts: drug misusers, misusers of public funds.
It's a straightforward agent noun from misuse, though the verb form remains more common than the noun.
One who mistreats others
- exploiterOne who uses unfairly
- oppressorOne who dominates cruelly
- tyrantCruel, absolute ruler
- bullyHabitual intimidator
harasser · perpetrator · tormentor · batterer · predator · dominator · manipulator · coercer
Compulsive dependent
- abuserOne who mistreats others
- overdoserOne exceeding safe dosage
- junkiePerson with compulsive dependency
- dependentRequiring outside support
alcoholic · druggie · substance abuser · chemical dependency · addiction · withdrawal · relapse · enabler
One who wastes wealth
- wasterOne who uses recklessly
- embezzlerOne misappropriating entrusted funds
- misappropriatorOne who steals entrusted funds
- mismanagerOne who leads badly
defrauder · pilferer · swindler · spendthrift · profligate · malfeasant · peculator · misapplication
Unauthorized system accessor
- pirateMaritime thief or bootlegger
- infringerOne who violates rights
- crackerCrisp baked wafer
- spammerSender of bulk junk
phisher · bootlegger · cybercriminal · troll · sockpuppet · software piracy · copyright infringement
abuser
One who mistreats others
bully · harasser · perpetrator · tormentor · batterer · predator · dominator · manipulator · coercer · victimizer
addict
Compulsive dependent
- abuserOne who mistreats others
- overdoserOne exceeding safe dosage
- junkiePerson with compulsive dependency
dependent · alcoholic · druggie · substance abuser · chemical dependency · addiction · withdrawal · relapse · enabler · intervention
squanderer
One who wastes wealth
- wasterOne who uses recklessly
- embezzlerOne misappropriating entrusted funds
- misappropriatorOne who steals entrusted funds
mismanager · defrauder · pilferer · swindler · spendthrift · profligate · malfeasant · peculator · misapplication · waste
hacker
Unauthorized system accessor
spammer · phisher · bootlegger · cybercriminal · troll · sockpuppet · software piracy · copyright infringement
- misuse of fundsImproper allocation of money
- substance misuseHarmful use of drugs/alcohol
- drug misuseHarmful use of substances
- data misuseImproper handling of information
- prescription misuseImproper use of medications
- apostrophe misuseIncorrect placement of punctuation mark