We don't have synonyms for catechises yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are catechism, catechize and catechist.
(v) :
Non-Oxford British English standard spelling of catechize. [To give oral instruction, especially of religion; (specifically) by the formal question-and-answer method; in the Church of England and Roman Catholic Church, to teach the catechism as preparation for confirmation.]
(v) :
Non-Oxford British English standard spelling of catechize. [To give oral instruction, especially of religion; (specifically) by the formal question-and-answer method; in the Church of England and Roman Catholic Church, to teach the catechism as preparation for confirmation.]