Sunni Islam vs Sunni

Sunni Islam and Sunni both are nouns.

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

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

Sunni Islam (noun)	Sunni (noun)
one of the two main branches of orthodox Islam	one of the two main branches of orthodox Islam
	a member of the branch of Islam that accepts the first four caliphs as rightful successors to Muhammad