castellan

from The Collaborative International Dictionary of English v.0.48
Castellan \Cas"tel*lan\, n. [OF. castelain, F. ch[^a]telain, L.
   castellanus pertaining to a castle, an occupant of a caste,
   LL., a governor of a castle, fr. L. castellum castle,
   citadel, dim. of castrum fortified place. See {Castle}, and
   cf. {Chatelaine}.]
   A governor or warden of a castle.
   [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
34 Moby Thesaurus words for "castellan":
      air warden, attendant, captain, caretaker, chatelain, chatelaine,
      commandant, commander, conservator, curator, custodian, director,
      executive, forest ranger, game warden, gamekeeper, governor,
      guardian, guardian angel, intendant, janitor, keeper, lifeguard,
      lifesaver, manager, master, next friend, prochein ami, ranger,
      ruler, shepherd, steward, warden, warder

    

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