umbel
umbellate
umbelliferous= umbellate
umber, -,  
umbilical, umbilical cord 
umbilicus
umbra 
umbrage, , 
umbrageous, , 
umbrella, ,  
umbrella-stand  
umbrella-tree 
umiak   
umlaut
umpire,  , 
umpteen, 
umpteenthfor the umpteenth time   
