Here is a chart with the various shades of brown.  The chart was taken from Wikipedia.

  Shades of Brown  
Auburn Bistre Brown Buff Burgundy Burnt sienna Burnt umber Copper Liver Mahogany Maroon Ochre
                       
Pale brown Raw Umber Russet Rust Sandy brown Seal brown Sepia Tan Wheat Zinnwaldite Fallow Taupe