Melted vs. molten
Both are past-tense and past-participial inflections of melt, but molten is usually reserved for metals and minerals.
Meter vs. metre
For units of measurement, it’s meter in the U.S. and metre outside the U.S. Measuring devices are spelled meter everywhere.
Marshal vs. martial
Martial: of or relating to war or the military. Marshal: 1. a person holding one of various official positions; 2. to enlist, arrange, organize, or gather (especially resources or military personnel).
Medal, meddle, metal, mettle
Medal: a piece of metal given as an award. Metal: the category of hard, shiny elements. Mettle: courage or quality of character. Meddle: to intrude on another’s affairs.
