big, big boy, big cheese, big gun, big leaguer, big shot, big wheel, big-timer, bigfoot, biggie, bigwig, fat cat, heavy, heavy hitter, heavyweight, high-muck-a-muck (or high-muckety-muck), honcho, kahuna, kingfish, kingpin, major leaguer, muckety-muck (also muck-a-muck), nabob, nibs, nob [chiefly British], pooh-bah (also poo-bah), wheel