Source : Webster's Revised Unabridged Dictionary (1913)

Lighterman \Light"er*man\ (-m[a^]n), n.; pl. {Lightermen}
   (-m[e^]n).
   A person employed on, or who manages, a lighter.

Source : WordNet®

lighterman
     n : someone who operates a barge [syn: {bargeman}, {bargee}]