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noun
Someone who takes up a position surreptitiously for the purpose of espionage.
is a specific kind of: spy, undercover agent.
derivation: infiltrate, penetrate.
An intruder (as troops) with hostile intent.
is a specific kind of: interloper, intruder, trespasser.
derivation: infiltrate, pass through.
Find more on infiltrator elsewhere: etymology - rhymes - Wikipedia.
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