Synonyms of infiltrator in English:

infiltrator


See US English definition of infiltrator

See UK English definition of infiltrator

See Spanish definition of infiltrado

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