| exploration(noun, search, survey, service, study) |
| inspection(noun, search, survey, exploration, review) |
| investigation(noun, search, service, survey, exploration) |
| scrutiny(noun, search, survey, review, service) |
| survey(noun, search, exploration, review, service) |
| recce(noun, search, service, survey, exploration) |
| examination(noun, search, survey, service, inspection) |
| probe(noun, search, service, survey, exploration) |
| scan(noun, search, service, survey, exploration) |
| scouting(noun, search, service, survey, exploration) |
| observation(noun, review, search, survey, study) |
| search(noun, survey, exploration, study, review) |
| reconnoiter(noun, exploration, search, service, survey) |
| recon(noun, informal, search, service, survey) |
| surveillance(noun, inspection, view, review, intelligence) |
| review(noun, inspection, study, view, search) |
| preliminary survey(expression, search, service, survey, exploration) |
| reconnoitre(noun, search, service, survey, exploration) |
| reconnaissance mission(expression, noun, idiom, search, service) |
| espionage(noun, inspection, inquiry, spying) |