Wordnet 3.0
NOUN (2)
1. 
 general who commanded the Carthaginian army in the second Punic War; 
 crossed the Alps and defeated the Romans but was recalled to defend Carthage and was defeated (247-182 BC); 
2. 
 a town in northeast Missouri on the Mississippi River; 
 boyhood home of Mark Twain; 
WordNet (r) 3.0 (2006):
Hannibal
    n 1: general who commanded the Carthaginian army in the second
         Punic War; crossed the Alps and defeated the Romans but was
         recalled to defend Carthage and was defeated (247-182 BC)
    2: a town in northeast Missouri on the Mississippi River;
       boyhood home of Mark Twain
U.S. Gazetteer Places (2000):
Hannibal, MO -- U.S. city in Missouri
   Population (2000):    17757
   Housing Units (2000): 7886
   Land area (2000):     14.610726 sq. miles (37.841604 sq. km)
   Water area (2000):    0.471622 sq. miles (1.221496 sq. km)
   Total area (2000):    15.082348 sq. miles (39.063100 sq. km)
   FIPS code:            30214
   Located within:       Missouri (MO), FIPS 29
   Location:             39.704065 N, 91.377378 W
   ZIP Codes (1990):     63401
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Hannibal, MO
    Hannibal
U.S. Gazetteer Places (2000):
Hannibal, NY -- U.S. village in New York
   Population (2000):    542
   Housing Units (2000): 235
   Land area (2000):     1.137452 sq. miles (2.945988 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    1.137452 sq. miles (2.945988 sq. km)
   FIPS code:            32017
   Located within:       New York (NY), FIPS 36
   Location:             43.320945 N, 76.576193 W
   ZIP Codes (1990):     13074
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Hannibal, NY
    Hannibal