WordNet (r) 3.0 (2006):

walk of life
    n 1: careers in general; "it happens in all walks of life" [syn:
         walk of life, walk]

Moby Thesaurus II by Grady Ward, 1.0:

28 Moby Thesaurus words for "walk of life":
   art, business, calling, career, career building, careerism, craft,
   game, handicraft, lifework, line, line of business, line of work,
   metier, mission, mystery, number, occupation, practice, profession,
   pursuit, racket, specialization, specialty, trade, vocation, walk,
   work