| Rektoskop | rectoscope |
| Spektroskop | spectroscope |
| Mutoskop | mutoscope |
| Otoskop | otoscope |
| Zystoskop | cystoscope |
| Endoskop | endoscope |
| Demoskop | pollster public opinion researcher |
| Mikroskop | microscope |
| Pedoskop | pedoscope |
| Rektus | direct case |
| Rektion | case government government |
| Rektor | rector principal |
| Rektorin | headmistress |
| Rekursion | recursion |
| Kolposkop | colposcope |
| hygroskop | hygroscopic |
| Gyroskop | gyroscope |
| Horoskop | horoscope |
| Koloskop | colonoscope |
| Pyroskop | pyroscope |