WordNet (r) 3.0 (2006):

rabbinate
    n 1: rabbis collectively
    2: the office or function of a rabbi

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "rabbinate":
   Sacred College, apostleship, call, care of souls, clergy,
   clerical order, clericals, holy orders, ministry, pastorage,
   pastoral care, pastorate, prelacy, presbytery, priestery,
   priesthood, priestship, sacred calling, the church, the cloth,
   the desk, the ministry, the pulpit, vocation