| Mars-Rover | Mars Rover |
| Marseiller | Marseillais |
| Marsianer | Martian |
| Märtyrer | martyr |
| Mangrove | mangrove |
| Manöver | manoeuvre maneuver |
| Mailserver | mail server |
| Marker | highlighter |
| Marone | sweet chestnut |
| Mars- | Martian |
| Marsoid | areoid |
| marmoriert | marbled |
| Marder | Mustelidae marten |
| Margarete | Margaret Margaretta Margery Marjorie Marjory |
| Margareten | Margareten |
| Margarine | margarine |
| Margerite | oxeye daisy |
| Marlspieker | marlinspike |
| Marmarameer | Sea of Marmara |
| Marmor | marble |