We don't have synonyms for shia islam yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are shiah islam and shi'i islam.
(n) :
Alternative form of Shi'a Islam. [The second largest denomination of Islam, followed by 200–300 million people, who's adherent's believe that Muhammad appointed Ali ibn Abi Talib as his successor prior to his death.]
(n) :
Alternative form of Shi'a Islam. [The second largest denomination of Islam, followed by 200–300 million people, who's adherent's believe that Muhammad appointed Ali ibn Abi Talib as his successor prior to his death.]