Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun infiltrator

2 senses of infiltrator

Sense 1
infiltrator -- (someone who takes up a position surreptitiously for the purpose of espionage)
       => spy, undercover agent -- ((military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors)

Sense 2
infiltrator -- (an intruder (as troops) with hostile intent)
       => intruder, interloper, trespasser -- (someone who intrudes on the privacy or property of another without permission)