Monaco: noun: Monegasque(s) or Monacan(s)
adjective: Monegasque or Monacan
Mongolia: noun: Mongolian(s)
adjective: Mongolian
Montserrat: noun: Montserratian(s)
adjective: Montserratian
Morocco: noun: Moroccan(s)
adjective: Moroccan
Mozambique: noun: Mozambican(s)
adjective: Mozambican