Ships passenger lists, census returns and other documents used in genealogy may give an ancestor’s occupation, this list gives more modern interpretations of those terms.
Macon/Macun/Marson – mason
Malender – farmer
Malster – brewer of malted beverages (beer)
Manciple – steward
Marescallus – marshall
Marshall – horse servant, or groom
Mason – stone carver
Mayer – physician
Medicus – leech; doctor
Mercator – merchant
Millow – miller
Millwright – one who designs or builds mills
Mintmaster – issuer of local currency [mintner?]
Molendinarius/Muner – miller
Monger – seller (of goods ie. ale, fish)
Muleskinner – teamster