Shiah vs Shiah Islam

Shiah and Shiah Islam both are nouns.

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

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

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

Other synonyms of Shiah include Shia.

Shiah (noun)	Shiah Islam (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