apprehender

1. A person who knows or apprehends (synset 110259779)
   is a type of: individual, mortal, person, somebody, someone, soul - a human being
   same as: knower
2. A person who seizes or arrests (especially a person who seizes or arrests in the name of justice) (synset 109820525)
   is a type of: individual, mortal, person, somebody, someone, soul - a human being

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