American Oxford Thesaurus
infiltrator
infiltrator noun once identified, the infiltrators were subjected to grueling questioning: spy, secret agent, undercover agent, operative, informant, informer, mole, plant, spook; intruder, interloper, subversive.
Oxford Thesaurus
infiltrator
infiltrator noun the constant vigilance needed to outwit enemy infiltrators: spy, agent, secret agent, undercover agent, operative, plant, intruder, interloper, subversive, informant, informer, mole, entrist, entryist; informal gatecrasher; N. Amer. informal spook; archaic intelligencer.
Duden Dictionary
Infiltrator
In fil t ra tor , In fil tra tor Substantiv, maskulin , der |Infiltr a tor |der Infiltrator; Genitiv: des Infiltrators, Plural: die Infiltratoren lateinisch-englisch Infiltrant
Infiltratorin
In fil t ra to rin , In fil tra to rin Substantiv, feminin , die |Infiltrat o rin |die Infiltratorin; Genitiv: der Infiltratorin, Plural: die Infiltratorinnen weibliche Form zu Infiltrator