WordNet (r) 3.0 (2006):

common people
    n 1: people in general (often used in the plural); "they're just
         country folk"; "folks around here drink moonshine"; "the
         common people determine the group character and preserve
         its customs from one generation to the next" [syn: folk,
         folks, common people]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "common people":
   bourgeoisie, common run, common sort, commonage, commonality,
   commonalty, commoners, commons, laborers, linendrapers,
   lower classes, lower middle class, lower orders,
   lumpen proletariat, middle class, middle orders, ordinary people,
   peasantry, plain folks, plain people, proletariat, rank and file,
   shopkeepers, small tradesmen, the lower cut, the other half,
   the third estate, toilers, toiling class, upper middle class,
   vulgus, working class, working people