| 1 | English | stroboscope | Instrument for studying or observing periodic... |
| 2 | English | scope | The breadth, depth or reach of a subject; a... |
| 3 | Italian | scopo | aim, end, goal; first-person singular present... |
| 4 | Latin | scopus | a target |
| 5 | Ancient Greek | σκοπός | watcher, lookout; protector, guardian; spy, scout |
| 6 | Ancient Greek | σκέπτομαι | I look at, examine; I examine, consider, think |
| 7 | Proto-Hellenic | sképťomai | to look at |
| 8 | Proto-Indo-European | spéḱyeti | to be looking at, to keep looking at |
| 9 | Proto-Indo-European | speḱ- | to see, to look, to observe |