Synonyms of infiltrator in English:

infiltrator


See definition of infiltrator

noun

1‘the constant vigilance needed to outwit enemy infiltrators’

SYNONYMS

spy, agent, secret agent, undercover agent, operative, plant, intruder, interloper, subversive, informant, informer, mole, entrist, entryist

informal gatecrasher

North American informal spook

archaic intelligencer