HOUSEKEEPING is a 12 letter word that starts with H.

1. \House"keep`ing\, n.
   1. The state of occupying a dwelling house as a householder.
   
   2. Care of domestic concerns; management of a house and home
      affairs.
   
   3. Hospitality; a liberal and hospitable table; a supply of
      provisions. [Obs.]
   
            Tell me, softly and hastily, what's in the pantry?
            Small housekeeping enough, said Ph[oe]be. --Sir W.
                                                  Scott.
   
   

2. \House"keep`ing\, a.
   Domestic; used in a family; as, housekeeping commodities.