We don't have synonyms for parabema yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are parabola, paranema and parapegma.
(n) :
(architecture) In Byzantine ecclesiastical architecture, the chapel of the prothesis or the diaconicon, or sacristy, where divided by walls from the bema or sanctuary.
(n) :
(architecture) In Byzantine ecclesiastical architecture, the chapel of the prothesis or the diaconicon, or sacristy, where divided by walls from the bema or sanctuary.