Wordnet 3.0
NOUN (1)
1. 
 (Greek mythology) the ferryman who brought the souls of the dead across the river Styx or the river Acheron to Hades; 
The Collaborative International Dictionary of English v.0.48:
Charon \Cha"ron\, n. [L., fr. Gr. ?.] (Cless. Myth.)
   The son of Erebus and Nox, whose office it was to ferry the
   souls of the dead over the Styx, a river of the infernal
   regions. --Shak.
   [1913 Webster]
WordNet (r) 3.0 (2006):
Charon
    n 1: (Greek mythology) the ferryman who brought the souls of the
         dead across the river Styx or the river Acheron to Hades
Moby Thesaurus II by Grady Ward, 1.0:
22 Moby Thesaurus words for "Charon":
   Aides, Aidoneus, Cerberus, Cora, Despoina, Dis, Dis pater, Erebus,
   Hades, Hel, Kore, Loki, Minos, Orcus, Osiris, Persephassa,
   Persephone, Pluto, Proserpina, Proserpine, Rhadamanthus, Satan