WordNet (r) 3.0 (2006):

Robin Hood
    n 1: legendary English outlaw of the 12th century; said to have
         robbed the rich to help the poor

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "Robin Hood":
   Autolycus, Barabbas, Bill Sikes, Claude Duval, Dick Turpin,
   Jack Sheppard, Jean Valjean, Jimmy Valentine, John Dillinger,
   Jonathan Wild, Raffles, Thief of Baghdad, Willie Sutton, almoner,
   almsgiver, benevolist, do-gooder, humanitarian, philanthropist,
   power for good, social worker, welfare statist, welfare worker,
   well-doer