| Main Entry: | infiltrator |
| Part of Speech: | noun |
| Definition: | intruder |
Synonyms: |
mole, spy |
| Main Entry: | intruder |
| Part of Speech: | noun |
| Definition: | person who trespasses |
Synonyms: |
burglar, criminal, gate-crasher, infiltrator, interferer, interloper, interrupter, invader, meddler, nuisance, obtruder, prowler, raider, snooper, squatter, thief, trespasser |
| Main Entry: | mole |
| Part of Speech: | noun |
| Definition: | spy |
Synonyms: |
agent, double agent, infiltrator, informer, inside man/woman, secret agent |
| Main Entry: | fifth column |
| Part of Speech: | noun |
| Definition: | secret or subversive group |
Synonyms: |
Trojan horse, collaborators, collaborators of enemy, infiltrators, saboteurs, subversives, underground |