| Isohypse | contour |
| Isomerie | isomerism |
| Isop | hyssop |
| Isopren | isoprene |
| Isotropie | isotropy |
| isotop | isotopic |
| Isotop | isotope |
| Isobare | isobar |
| Isochrone | isochrone |
| Isogamie | isogamy |
| Isoglosse | isogloss |
| Isolde | Eseld Iseult Isold Isolda Isolde Isolt |
| Isotherme | isotherm |
| Misogynie | misogyny |
| Sohle | sole bottom floor horizon level |
| Chypre | chypre |
| Hyphe | hypha |
| Hype | hype |
| Prolepse | prolepsis |
| Möpse | boobies boobs |