| Inputfaktor | factor of production |
| Induktor | inductor |
| Instruktor | instructor |
| Initiator | initiator |
| Inkubator | incubator business incubator |
| Umweltfaktor | environmental factor |
| Formfaktor | form factor |
| Biofaktor | biofactor |
| Faktor | factor merchant |
| Klirrfaktor | distortion factor |
| Manufaktur | manufactory manufacture |
| Primfaktor | prime factor |
| Rhesusfaktor | Rhesus factor |
| Störfaktor | disruptive element |
| Interaktom | interactome |
| Brutreaktor | fast breeder fast breeder reactor |
| Distraktor | distracter |
| Traktor | tractor |
| intakt | intact |
| Inspektor | inspector |