heavyweight

one of high position or importance within a group a heavyweight in the U.S. Senate, he has a lot of clout in judicial confirmations Synonyms big, big boy, big cheese, bigfoot, biggie, big gun, big leaguer, big-timer, big wheel, bigwig, fat cat, heavy, heavy hitter, big shot, high-muck-a-muck (or high-muckety-muck), honcho, kahuna, kingfish, kingpin, major leaguer, muckety-muck (also muck-a-muck or mucky-muck), nabob, nawab, nibs, nob [chiefly British], pooh-bah (also poo-bah), wheelRelated Words baron, czar (also tsar or tzar), king, lion, magnate, mogul, prince, tycoon; VIPNear Antonyms inferior, subordinate, underling; mediocrity, obscurityAntonyms lightweight, nobody, nonentity, nothing, shrimp, twerp, whippersnapper, zero, zilch