WordNet (r) 3.0 (2006):

Last Supper
    n 1: the traditional Passover supper of Jesus with his disciples
         on the eve of his crucifixion [syn: Last Supper, Lord's
         Supper]

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "Last Supper":
   Communion, Eucharist, Holy Communion, Host, Sacrament Sunday,
   altar bread, bread, bread and wine, consecrated bread,
   consecrated elements, consubstantiation, elements, impanation,
   intinction, loaf, real presence, subpanation, the Holy Sacrament,
   the Sacrament, transubstantiation, wafer