| iterieren | iterate |
| reiterieren | reiterate |
| alterieren | upset alter inflect |
| internieren | intern |
| digerieren | digesting |
| inserieren | advertise |
| operieren | operate |
| Nitrieren | nitriding |
| nitrieren | nitrate nitrify nitride |
| integrieren | integrate |
| titrieren | titrate |
| miterleben | alive |
| Interferon | interferon |
| zenterieren | center |
| Interferenz | interference |
| alternieren | alternate |
| interagieren | interact |
| interviewen | interview |
| föderieren | federate |
| maserieren | graining |