| Formfaktor | form factor |
| Primfaktor | prime factor |
| Störfaktor | disruptive element |
| Formkasten | flask |
| Reformator | reformer |
| formbar | malleable |
| Formant | formant |
| Format | shape |
| Formation | formation |
| Formativ | formative |
| Biofaktor | biofactor |
| Faktor | factor merchant |
| Klirrfaktor | distortion factor |
| Fraktur | fracture blackletter script |
| Reaktor | reactor |
| Refraktor | refracting telescope refractor |
| Traktor | tractor |
| Korrektor | proofreader |
| Filmautor | screenwriter |
| Formalie | formality |