| Oktaeder | octahedron |
| Oktave | octave octonion Cayley algebra Cayley numbers |
| Oktober | October |
| Akkader | Akkadian |
| Kader | cadre |
| Oktagon | octagon |
| Oktal- | octal |
| Oktant | Octans |
| Kuboktaeder | cuboctahedron |
| Oktaederstumpf | truncated octahedron |
| Oktole | octuplet |
| oktal | octal |
| Heptaeder | heptahedron |
| Matador | bullfighter |
| Pentaeder | pentahedron |
| Pfortader | portal vein |
| Stadel | barn |
| Städter | urbanite city dweller townsman town dweller townie |
| Tadel | censure |
| Dekaeder | decahedron |