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Infiltrator (Noun)

An intruder (as troops) with hostile intent.

Nouns denoting people.

The enemy infiltrator was able to sneak past the guards undetected and gather crucial information about the base.
A lone infiltrator was sent to sabotage the communication lines of the opposing army.
The infiltrator, disguised as a local civilian, was caught by the authorities after a tip from a suspicious neighbor.
The team of infiltrators was tasked with gathering intel on the enemy's plans and reporting back to headquarters.
A skilled infiltrator managed to breach the high-security facility by posing as a maintenance worker.

Someone who takes up a position surreptitiously for the purpose of espionage.

Nouns denoting people.

The double agent was suspected of being an infiltrator, working secretly for a rival organization.
A highly skilled infiltrator, she had managed to gain the trust of the target's inner circle.
The agency's most experienced infiltrator was sent undercover to gather intel on the enemy's plans.
After months of surveillance, the police finally identified the infiltrator who had been feeding information to the opposing side.
As a seasoned infiltrator, he knew how to blend in seamlessly with his surroundings and avoid detection.