big league

from WordNet (r) 3.0 (2006)

big league
    n 1: the most important league in any sport (especially
         baseball) [syn: {major league}, {big league}, {majors}]

from Moby Thesaurus II by Grady Ward, 1.0

23 Moby Thesaurus words for "big league":
      big, big-name, big-time, bigwig, bigwigged, consequential,
      considerable, double-barreled, earthshaking, grand, great,
      heavyweight, high-powered, important, major, material, momentous,
      name, self-important, significant, substantial, superior,
      world-shaking