duchy

from WordNet (r) 3.0 (2006)

duchy
    n 1: the domain controlled by a duke or duchess [syn: {duchy},
         {dukedom}]

from The Collaborative International Dictionary of English v.0.48

Duchy \Duch"y\ (d[u^]ch"[y^]), n.; pl. {Duchies}. [F. duch['e],
   OF. duch['e]e, (assumed) LL. ducitas, fr. L. dux. See
   {Duke}.]
   The territory or dominions of a duke; a dukedom.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

93 Moby Thesaurus words for "duchy":
      Kreis, ally, archbishopric, archdiocese, archduchy, archdukedom,
      arrondissement, bailiwick, bishopric, body politic, borough,
      buffer state, canton, captive nation, chieftaincy, chieftainry,
      city, city-state, colony, commonweal, commonwealth, commune,
      congressional district, constablewick, country, county,
      departement, diocese, district, domain, dominion, dukedom, earldom,
      electoral district, electorate, empery, empire, free city,
      government, grand duchy, hamlet, hundred, kingdom, land,
      magistracy, mandant, mandate, mandated territory, mandatee,
      mandatory, metropolis, metropolitan area, nation, nationality,
      oblast, okrug, parish, polis, polity, possession, power, precinct,
      principality, principate, protectorate, province,
      puppet government, puppet regime, realm, region, republic, riding,
      satellite, seneschalty, settlement, sheriffalty, sheriffwick,
      shire, shrievalty, soke, sovereign nation, stake, state, sultanate,
      superpower, territory, toparchia, toparchy, town, township,
      village, wapentake, ward