The ones I have on my list are Merit and Maverick.
Some other "word" ones...sorry if I'm going a little overboard here. Names are fun.
Macro
Mason
Matrix
Madcap
Maze
Maestro
Melee
Mandate
Mango
Manor/Mansion (would go well with Kastle!)
March
Metric
Mayhap
Meddle
Medieval (this one too)
Merry
Merchant
Mesmer
Metro