| 1 | Ancient Greek | σκοπός | watcher, lookout; protector, guardian; spy, scout |
| 2 | Ancient Greek | σκέπτομαι | I look at, examine; I examine, consider, think |
| 3 | Proto-Hellenic | sképťomai | to look at |
| 4 | Proto-Indo-European | spéḱyeti | to be looking at, to keep looking at |
| 5 | Proto-Indo-European | speḱ- | to see, to look, to observe |