| scope(verb, consider, see, regard, follow) |
| scrutinize(verb, mark, consider, see, note) |
| sentinel(noun, case, watch, overlook, guard) |
| set eyes on(verb, expression, idiom, phrasal verb, consider) |
| sleepless eye(noun, expression, eyesight, hawkeye) |
| spot(verb, mark, consider, see, note) |
| spy(verb, mark, consider, see, note) |
| spying(bug, scrutiny, investigation, monitor, tap) |
| stakeout(bug, scrutiny, investigation, monitor, tap) |
| stare(verb, fix, consider, see, regard) |
| stewardship |
| study(noun, verb, mark, see, note) |
| superintendence(bug, scrutiny, investigation, monitor, tap) |
| supervision(noun, control, care, watch, guard) |
| survey(noun, verb, study, mark, consider) |
| surveyance(bug, scrutiny, investigation, monitor, tap) |
| tail(bug, scrutiny, investigation, monitor, tap) |
| take in(verb, expression, phrasal verb, mark, consider) |
| tap(bug, scrutiny, investigation, monitor, shadowing) |
| track(bug, scrutiny, investigation, monitor, tap) |