WordNet (r) 3.0 (2006):

honcho
    n 1: a person who exercises control over workers; "if you want
         to leave early you have to ask the foreman" [syn:
         foreman, chief, gaffer, honcho, boss]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "honcho":
   boss, chief, chieftain, cock, electronics king, head, headman,
   hierarch, king, lead, leader, leading light, luminary, master,
   master spirit, paramount, prima donna, principal, star, superstar,
   top dog