We don't have synonyms for monstrances yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are monstrance and remonstrances.
(n) :
(Christianity) An ornamental, often precious receptacle, either open or with a transparent cover, in which the sacramental bread (consecrated host) is placed for Eucharistic adoration.
(n) :
(Christianity) An ornamental, often precious receptacle, either open or with a transparent cover, in which the sacramental bread (consecrated host) is placed for Eucharistic adoration.