appropriator

Definitions of appropriator
1

n someone who takes for his or her own use (especially without permission)

Types:
kleptomaniac
someone with an irrational urge to steal in the absence of an economic motive
poacher
someone who hunts or fishes illegally on the property of another
pre-emptor, preemptor
someone who acquires land by preemption
Type of:
acquirer
a person who acquires something (usually permanently)

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