catechist

from WordNet (r) 3.0 (2006)

catechist
    n 1: one who instructs catechumens in preparation for baptism
         (especially one using a catechism)

from The Collaborative International Dictionary of English v.0.48

Catechist \Cat"e*chist\ (k[a^]t"[-e]*k[i^]st), n. [L.
   catechista, fr. Gr.]
   One who instructs by question and answer, especially in
   religions matters.
   [1913 Webster] Catechistic