| spy(noun, verb, person, information, follow) |
| snoop(noun, verb, person, plant, examine) |
| detective(noun, information, plant, watch, investigate) |
| gumshoe(noun, slang, investigate, agent, spy) |
| stag(verb, examine, case, discover, watch) |
| scout(noun, verb, person, plant, examine) |
| tail(noun, verb, examine, case, discover) |
| snooper(noun, agent, spy, hound, sneak) |
| shadow(noun, verb, examine, case, discover) |
| trail(verb, examine, case, discover, pursue) |
| case(verb, examine, discover, watch, scrutinize) |
| catch sight of(verb, expression, idiom, examine, case) |
| discover(verb, examine, watch, scrutinize) |
| examine(verb, discover, watch, scrutinize) |
| eyeball(verb, examine, case, discover, watch) |
| fish out(verb, expression, examine, case, discover) |
| get a load of(verb, expression, idiom, examine, discover) |
| glimpse(verb, examine, discover, watch, scrutinize) |
| keep under surveillance(verb, expression, idiom, examine, case) |
| look for(verb, expression, examine, case, discover) |