| lookout(noun, place, plant, watch, guard) |
| picket(noun, person, plant, watch, guard) |
| scout(noun, person, plant, case, watch) |
| guide(noun, watch, lookout) |
| pathfinder(noun, watch, lookout) |
| patrol(noun, plant, case, watch, overlook) |
| reconnoiterer(noun, watch, guard, lookout) |
| detective(noun, plant, watch, guard, agent) |
| emissary(noun, plant, watch, agent) |
| escort(noun, watch, guard, lookout) |
| guard(noun, watch, lookout, patrol) |
| intelligencer(noun, plant, agent, operative) |
| mole(noun, plant, watch, agent) |
| sleeper(noun, plant, agent, operative) |
| sleuth(noun, plant, watch, guard, agent) |
| undercover agent(noun, expression, plant, watch, agent) |
| advance(noun, watch, guard, lookout) |
| adventurer(noun, watch, guard, lookout) |
| investigating(noun, watch, guard, lookout) |
| outpost(noun, watch, guard, lookout) |