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The word 'infiltrator' is correct and usable in written English.
It refers to someone who secretly enters a place or organization to gather information or disrupt operations. It can also refer to a substance or force that permeates or seeps into something. Example: The spy was identified as an infiltrator into the enemy's headquarters, gathering intel on their plans and movements.
Dictionary
infiltrator
noun
One who infiltrates an organization or territory; an undercover or covert agent.
synonyms
Exact(60)
Military analysts doubt whether Iraq has the technology to launch a chemically-tipped missile without having it detected first, or having the chemicals destroyed in flight.But in Kuwait's coffee shops the fear persists that a lone, suicidal Iraqi infiltrator could slip into the country and release a deadly aerosol of anthrax or some other biological horror.
"If he had been a Taliban infiltrator he could have killed him a long time ago".
Enormous and knuckle-ringed, with a ZZ Top beard, Hunt, an ex-cop and former infiltrator of the Aryan Brotherhood prison gang, ushers us into the topsy-turvy realm of people like him: A.T.F.
Suppose your infiltrator has crossed into Syria and been accepted by ISIS as a new recruit.
"Wasn't an explorer really just an infiltrator, someone who penetrated alien lands and returned with secrets?" you write.
To the extent that Latvala was the Deadheads' infiltrator and proxy, it became a kind of enthusiasts' enterprise.
But many rebels, fearing that he was an infiltrator, wanted to send Morgan back to Havana.
It is always rewarding, Amis writes, "to spot a would-be... infiltrator".
A young Jewish Legion volunteer who gave his name as Rachmiel wore protective padding and played the role of an Arab infiltrator.
He said that the dogs could smell the difference between an Arab infiltrator and a Jewish resident.
"The cook was an enemy infiltrator who has joined the insurgents after the shooting, but his accomplice was arrested," Mr. Farhang said.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com