WHEREABOUT is a 10 letter word that starts with W.

1. \Where"a*bout`\, Whereabouts \Where"a*bouts`\, adv.
   1. About where; near what or which place; -- used
      interrogatively and relatively; as, whereabouts did you
      meet him?
   
   Note: In this sense, whereabouts is the common form.
   
   2. Concerning which; about which. ``The object whereabout
      they are conversant.'' --Hooker.
   
   
   
   

2. \Where"a*bout`\, Whereabouts \Where"a*bouts`\, n.
   The place where a person or thing is; as, they did not know
   his whereabouts. --Shak.
   
         A puzzling notice of thy whereabout.     --Wordsworth.