| Ingestion | ingestion |
| Indigestion | indigestion |
| Invention | invention |
| Infektion | infection |
| Injektion | injection shot |
| Intention | intention |
| Kingston | Kingston |
| ingeniös | ingenious |
| Gestirn | celestial body |
| Suggestion | persuasion |
| Infestation | infestation |
| inzestuös | incestuous |
| Investition | investment |
| Investor | investor |
| Insertio | minionette |
| infektiös | infectious |
| Induktion | induction electromagnetic induction mathematical induction |
| Inflation | inflation |
| Inspektion | inspection |
| Intuition | intuition |