| 1 | English | tacky | Of a substance, slightly sticky; Of low quality;... |
| 2 | English | tack | A small nail with a flat head; A thumbtack; A... |
| 3 | French | tache | blot, stain or smear; spot; more or less... |
| 4 | Old French | tasche | duty; obligation |
| 5 | Medieval Latin | tasca | — |
| 6 | Latin | taxa | second-person singular present active imperative... |
| 7 | Latin | taxāre | — |
| 8 | Latin | Taxus | yew |
| 9 | Ancient Greek | εἶδος | That which is seen: form, image, shape;... |
| 10 | Spanish | -scopio | -scope |
| 11 | Latin | -scopium | — |
| 12 | Ancient Greek | σκοπέω | I look, look at, behold; I examine, inspect; 413... |
| 13 | Ancient Greek | σκοπός | watcher, lookout; protector, guardian; spy, scout |
| 14 | Ancient Greek | σκέπτομαι | I look at, examine; I examine, consider, think |
| 15 | Proto-Hellenic | sképťomai | to look at |
| 16 | Proto-Indo-European | spéḱyeti | to be looking at, to keep looking at |
| 17 | Proto-Indo-European | speḱ- | to see, to look, to observe |