| Optoelektronik | optoelectronics |
| Elektronik | electronics electronic circuit |
| Optometrie | optometry |
| Plektron | plectrum |
| Geotektonik | tectonics |
| Tektonik | tectonics |
| Optometrist | optometrist |
| optometrisch | optometric |
| Kolektomie | colectomy |
| isoelektronisch | isoelectronic |
| Elektron | electron electrum |
| Elektroniker | electronics technician |
| Oophorektomie | oophorectomy |
| Protektion | patronage |
| Protektionist | protectionist |
| Projektion | projection |
| Spintronik | spintronics |
| Poliklinik | polyclinic |
| Optikerin | optician |
| optieren | opt |