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Noun infiltrator has 2 senses
  1. infiltrator - someone who takes up a position surreptitiously for the purpose of espionage
    --1 is a kind of     spy, undercover agent
    Derived form: verb infiltrate2
  2. infiltrator - an intruder (as troops) with hostile intent
    --2 is a kind of     intruder, interloper, trespasser
    Derived form: verb infiltrate4
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