| Filzlaus | crab louse pubic louse |
| Filzhut | fedora |
| Filius | junior son |
| Nikolaus | Saint Nicholas Santa Claus Nicholas Nickolas Nikolas Niccolas Nichalas Nichelas |
| Feldmaus | common vole field mouse |
| Holzhaus | wooden house |
| Filtrat | filtrate |
| Filzer | felt-tip |
| Filiale | branch |
| Fillér | fillér |
| Filmblut | stage blood theatrical blood |
| Filmriss | blackout |
| Filz | felt miser |
| filzen | frisk felt |
| Eilzug | express limited-stop train |
| salzlos | saltless |
| Salzlake | pickle |
| Eislauf | ice skating |
| Inlaut | inlaut |
| Reblaus | phylloxera |