| infra- | infra- |
| intra- | intra- |
| infam | infamous |
| infrage | contemplable eligible in question |
| Infos | lowdown |
| Infrarot | infrared |
| infrarot | infrared |
| Infant | infante |
| Infarkt | infarction |
| Infekt | infection |
| Inferno | inferno |
| Infix | infix |
| Info | info |
| Ahnfrau | foremother |
| Anfrage | enquiry inquiry |
| Obfrau | umpire |
| Afra | Aphra |
| Frau | woman wife spouse Mrs. |
| Safran | saffron |
| tera- | tera- |
| Tera- | tera- |