We don't have synonyms for murrha yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are myrrha, murra and murtha.
(n) :
Alternative form of murra (“ornamental stone”). [(historical) An ornamental stone for vases, etc. described by Pliny, most probably fluorspar; it was first brought to Rome by Pompey, 61 B.C.]
(n) :
Alternative form of murra (“ornamental stone”). [(historical) An ornamental stone for vases, etc. described by Pliny, most probably fluorspar; it was first brought to Rome by Pompey, 61 B.C.]