WordNet (r) 3.0 (2006):

Sherlock Holmes
    n 1: a fictitious detective in stories by A. Conan Doyle [syn:
         Sherlock Holmes, Holmes]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "Sherlock Holmes":
   Bow Street runner, FBI, FBI agent, Federal, G-man, Secret Service,
   Sherlock, T-man, detective, dick, eye, fed, gumshoe, hawkshaw,
   hotel detective, house detective, house dick, inquiry agent,
   investigator, narc, operative, plainclothesman, police detective,
   private detective, private investigator, revenuer, sleuth,
   store detective, tec, treasury agent