1. 
[syn: big shot, big gun, big wheel, big cheese, big deal, big enchilada, big fish, head honcho]
WordNet (r) 3.0 (2006):
big wheel
    n 1: an important influential person; "he thinks he's a big
         shot"; "she's a big deal in local politics"; "the Qaeda
         commander is a very big fish" [syn: big shot, big gun,
         big wheel, big cheese, big deal, big enchilada,
         big fish, head honcho]
Moby Thesaurus II by Grady Ward, 1.0:
47 Moby Thesaurus words for "big wheel":
   BMOC, Rasputin, Svengali, VIP, access, bad influence, big boy,
   big cheese, big gun, big noise, big shot, big-time operator,
   big-timer, bigwig, chief, court, eminence grise, five-percenter,
   friend at court, good influence, gray eminence, heavyweight,
   hidden hand, high-muck-a-muck, his nibs, influence,
   influence peddler, influencer, ingroup, key, kingmaker, lobby,
   lobbyist, lords of creation, man of influence, manipulator,
   open sesame, powers that be, pressure group, sinister influence,
   special interests, special-interest group, the Establishment,
   very important person, wheel, wheeler-dealer, wire-puller