| monolítico | monolithic |
| monomanía | monomania |
| Monomotapa | Munhumutapa Empire |
| mononucleosis | mononucleosis |
| mononucleosis infecciosa | glandular fever |
| Mononykus | Mononykus |
| monopatinaje | skateboarding |
| monopatín | scooter |
| Monoplacophora | Monoplacophora |
| monoplano | monoplane |
| Monoplaza | Open wheel car |
| monopolio | monopoly |
| Monopolio bilateral | Bilateral monopoly |
| monopolista | monopolist |
| monopolizador | engrossing |
| monopolizar | monopolize |
| Monopoly | Monopoly |
| monoptongo | monophthong |
| monorrimo | monotonous |
| monos animados | cartoon |
| Monos en el espacio | Monkeys in space |
| Monosacàrid | Sugar |
| Monosacárido | Sugar |
| monosilábico | monosyllabic |
| monosílabo | monosyllabic |
| Monotelismo | Monothelitism |
| monoteísmo | monotheism |
| monoteísta | monotheistic |
| monotono | monotonous |
| monotonía | monotony |
| Monotrema | Monotreme |
| Monotremata | Monotreme |
| Monotropa | Monotropa |
| Monotype | Monotype Corporation |
| Monreale | Monreale |
| Monrovia | Monrovia |
| Mons | Mons |
| Mons-en-Pévèle | Battle of Mons-en-Pévèle |
| Monsanto | Monsanto |
| monserga | balderdash |
| monseñor | monsignor |
| Monseñor Nouel | Monseñor Nouel Province |
| Monsieur Verdoux | Monsieur Verdoux |
| Monsignore | Monsignor |
| Monster House | Monster House |
| Monstera deliciosa | Monstera deliciosa |
| Monstrous moonshine | Monstrous moonshine |
| monstruo | whopper |
| Monstruo de Espagueti Volador | Flying Spaghetti Monster |
| Monstruo de Flatwoods | Flatwoods monster |
| monstruo de Gila | Gila monster |
| Monstruo de las Galletas | Cookie Monster |
| Monstruo del lago Ness | Loch Ness Monster |
| monstruosidad | barbarism |
