| flüssig | liquid fluent |
| Flüssiggas | liquefied gas liquid gas |
| Flüssigsein | liquidity |
| Flüssigkeit | liquid fluid liquor |
| Fluß | thread |
| Fluss | river flow fluency flux |
| fluffig | fluffy |
| lustig | funny jocular gay merry happy |
| Aussig | Ústí nad Labem |
| nussig | nutty |
| rußig | fuliginous |
| müßig | idle otiose useless futile pointless |
| lässig | laid-back casual careless easily really |
| fleißig | diligent industrious assiduous hardworking keen studious |
| flapsig | uncouth |
| Fluorid | fluoride |
| Fluorit | fluorite |
| Flush | flush |
| Flussaue | floodplain |
| Flüssigerdgas | liquefied natural gas |