WordNet (r) 3.0 (2006):

rich man
    n 1: a man who is wealthy [syn: man of means, rich man,
         wealthy man]

Moby Thesaurus II by Grady Ward, 1.0:

20 Moby Thesaurus words for "rich man":
   Daddy Warbucks, billionaire, bloated plutocrat, capitalist,
   fat cat, individualist, man of means, man of substance,
   man of wealth, millionaire, moneybags, moneyed man,
   multimillionaire, nabob, parvenu, plutocrat, richling,
   rugged individualist, warm man, wealthy man