We don't have synonyms for myrrhs yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are myrrh, myrrhis and myrrha.
(n) :
A red-brown resinous material, the dried sap of a tree of the genus Commiphora, especially Commiphora myrrha, used as perfume, incense or medicine.
(n) :
A red-brown resinous material, the dried sap of a tree of the genus Commiphora, especially Commiphora myrrha, used as perfume, incense or medicine.