We don't have synonyms for reish yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are relish, reism and reich.
(n) :
Alternative spelling of resh. [The twentieth letter of many Semitic alphabets/abjads (Phoenician, Aramaic, Hebrew, Syriac, Arabic and others). It is homologous with Greek rho and Latin r.]
(n) :
Alternative spelling of resh. [The twentieth letter of many Semitic alphabets/abjads (Phoenician, Aramaic, Hebrew, Syriac, Arabic and others). It is homologous with Greek rho and Latin r.]