WordNet (r) 3.0 (2006):

easy street
    n 1: financial security

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "Easy Street":
   affluence, bed of roses, clover, comfort, ease, easy circumstances,
   felicity, fleshpots, gracious life, gracious living, happiness,
   lap of luxury, life of ease, loaves and fishes, luxury, prosperity,
   prosperousness, security, success, the affluent life,
   the good life, thriving condition, upward mobility, velvet, weal,
   wealth, welfare, well-being