seizer

/ˈsizər/
noun
  1. A person or thing that takes hold of something suddenly and forcibly.
    • In the game, the seizer of the flag wins the round.
    • The seizer of the opportunity quickly signed the contract.
    • The seizer of the stolen painting was caught on camera.
  2. A person who takes possession of something by legal authority or force.
    • The seizer of the illegal goods was a customs officer.
    • The seizer of the abandoned land had to prove ownership in court.
    • During the war, the seizer of enemy property faced many legal challenges.