We don't have synonyms for pixes yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are pipes, piles and fixes.
(n) :
Obsolete spelling of pyx. [(Roman Catholicism, also figurative) A small, usually round container used to hold the host (“consecrated bread or wafer of the Eucharist”), especially when bringing communion to the sick or others unable to attend Mass.]
(v) :
Obsolete spelling of pyx. [(obsolete) To place (the host) in a pyx.]
(n) :
Obsolete spelling of pyx. [(Roman Catholicism, also figurative) A small, usually round container used to hold the host (“consecrated bread or wafer of the Eucharist”), especially when bringing communion to the sick or others unable to attend Mass.]
(v) :
Obsolete spelling of pyx. [(obsolete) To place (the host) in a pyx.]