Maui
Mini
Moscow, Malawi, Malaysia
maintain
Mump.
mass
mars
A synonym for fable (4 letters, beginning with M) is myth.
Moat, Mole, More, Most, Mast, Mash,
Michigan is a place
A four-letter word for "jug" starting with "e" is usually "ewer."
Moronic is an insult. It begins with the letter m.
magnums