| Oktagon | octagon |
| Oktogon | octagon |
| Oktal- | octal |
| Oktant | Octans |
| Oktonion | octonion |
| Oktaeder | octahedron |
| Oktave | octave octonion Cayley algebra Cayley numbers |
| oktal | octal |
| Jatagan | yataghan |
| Septagon | septagon |
| Yatagan | yataghan |
| Heptagon | heptagon |
| Mutagen | mutagen |
| mutagen | mutagenic |
| Pentagon | pentagon Pentagon |
| tagen | dawn meet |
| Dragon | tarragon |
| Wagon | car |
| Agon | agon |
| Estragon | tarragon dragon's-wort |