hoarder

/ˈhɔrdər/
noun
  1. A person who collects and keeps large amounts of things, often more than they need, and has difficulty throwing anything away.
    • After years of being a hoarder, he finally hired a professional organizer to help him clean up.
    • The TV show featured a hoarder who had filled every room in her house with boxes of clothes and toys.
    • My aunt is a hoarder; her garage is so full of old newspapers that she can't park her car inside.
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