The DICT Development Group

  top dog
      n 1: a person who is in charge; "the head of the whole
           operation" [syn: head, chief, top dog]

  60 Moby Thesaurus words for "top dog":
     A per se, ace, boss, champ, champion, chief, commander,
     conquering hero, conqueror, conquistador, dean, defeater, doyen,
     doyenne, easy winner, electronics king, fugleman, genius, head,
     hero, high priest, higher-up, honcho, important person, king,
     kingfish, kingpin, laureate, lead, leader, leading light, luminary,
     master, master spirit, nonpareil, pancratiast, paragon, paramount,
     personage, prima donna, principal, prodigy, ruler, runner-up,
     senior, shoo-in, star, subduer, subjugator, superior, superman,
     superstar, sure winner, the greatest, the most, triumpher,
     vanquisher, victor, virtuoso, winner