important person vs high-muck-a-muck

Other hyponyms of important person include big cheese, big deal, big enchilada, big fish, big gun, big shot, big wheel, head honcho, celebrity, famous person, behemoth, colossus, giant, heavyweight, titan, elder statesman, eminence grise, Excellency, fixer, influence peddler, heavy hitter, hierarch, pooh-bah, kingmaker, bigwig, kingpin, top banana, magnifico, figure, name, public figure, nepotist, policy maker, power broker, powerbroker, sacred cow, sirdar, socialite, sun, dignitary, high-up, high muckamuck, panjandrum, very important person, VIP, worthy.