monotonous
mar
Motionless is a synonym for calmness. It begins with the letter m.
manducate
mars
Likely candidate is the word: Inform.
Muertos It means deadDia De Los Muertos is the day of the dead
pablum
Moronic is an insult. It begins with the letter m.
magnums
an Olympic sport starting with m is marathon
A salad starting with the letter M could be a macaroni salad.
Moss Moon Moose Midge Mollusk