tower in WordNet English dictionary

1. anything that approximates the shape of a column or tower
   "the test tube held a column of white powder"; "a tower of dust rose above the horizon"; "a thin pillar of smoke betrayed their campsite"
   column  tower  pillar 
   
2. a powerful small boat designed to pull or push larger ships
   tugboat  tug  towboat  tower 
   
3. a structure taller than its diameter; can stand alone or be attached to a larger building
   tower 
   

1. appear very large or occupy a commanding position
   "The huge sculpture predominates over the fountain"; "Large shadows loomed on the canyon wall"
   loom  tower  predominate  hulk