haw1
  
  n.
 the red fruit of the hawthorn.
 
  Etymology
  OE haga, of Gmc origin, prob. rel. to hedge.
 
  
    
haw2
  
  n.
 the third eyelid or nictitating membrane in certain mammals, especially dogs and cats.
 
  Etymology
  ME (denoting a discharge from the eye): of unknown origin.