| probe(verb, study, consider, sound, examine) |
| prosecutor(noun, opposition, agent, villain, rebel) |
| ransack(verb, turn, ravage, inquiry) |
| read(verb, study, mark, consider, see) |
| recognise |
| reconnoiterer(watch, guard, lookout, patrol, detective) |
| reporter(agent, sneak, informer, messenger, informant) |
| rummage(verb, search, ransack, inquiry) |
| scope(verb, consider, see, note, regard) |
| scout out(expression, seek, search, hunt) |
| search out(verb, expression, phrasal verb, detect) |
| sentinel(noun, watch, guard, warning, ward) |
| shop |
| snitcher(grass, sneak, decoy, informer, informant) |
| sound |
| spies |
| spy upon(verb, phrasal verb) |
| squealer(grass, sneak, decoy, informer, informant) |
| stalker |
| stoolie(grass, sneak, decoy, informer, informant) |