MONTE is a 5 letter word that starts with M.

1. \Mon"te\, n. [Sp., lit., mountain, hence, the stock of
   cards remaining after laying out a certain number, fr. L.
   mons, montis, mountain.]
   A favorite gambling game among Spaniards, played with dice or
   cards.
   
   

2. \Mon"te\, n.
   In Spanish America, a wood; forest; timber land; esp., in
   parts of South America, a comparatively wooden region.