Shiah Islam vs Shiah

Shiah Islam and Shiah both are nouns.

Word	Noun	Adjective	Verb	Adverb
Shiah Islam	Yes	No	No	No
Shiah	Yes	No	No	No

As nouns, Shiah Islam and Shiah are synonyms defined as:

Shiah Islam and Shiah: one of the two main branches of orthodox Islam; mainly in Iran

Other synonyms of Shiah Islam include Shia.

Shiah Islam (noun)	Shiah (noun)
one of the two main branches of orthodox Islam; mainly in Iran	one of the two main branches of orthodox Islam; mainly in Iran