| Skioptikon | magic lantern |
| Idiotikon | idioticon |
| Koptin | Copt |
| Adoption | adoption affiliation |
| Option | option |
| Synoptik | synoptic meteorology |
| Skeptiker | skeptic |
| Sorption | sorption |
| Klitikon | clitic |
| Silikon | silicone |
| Skiort | ski resort |
| Skipiste | ski track |
| Skispringen | ski jumping |
| Koptisch | Coptic |
| koptisch | Coptic |
| Kaufoption | call option purchase option |
| Kooptation | co-optation co-option |
| Optik | optics |
| Optiker | optician |
| Panoptikum | wax museum |