| Moscovium | moscovium |
| Moskovium | Moscovian |
| Moschus | musk |
| Osculum | osculum |
| Callovium | Callovian |
| Kasimovium | Kasimovian |
| Flerovium | flerovium |
| Monrovia | Monrovia |
| Muskovit | muscovite |
| Kolluvium | colluvium |
| Ischium | ischium |
| Messinium | Messinian |
| Monopodium | monopodium |
| Ossarium | ossuary |
| Oxonium | oxonium |
| Tortonium | Tortonian |
| Kollodium | collodion |
| Moratorium | moratorium |
| Morphium | morphine |
| Myonium | muonium |