Sunni vs sect

Sunni and sect both are nouns.

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

As nouns, sect is a hypernym of Sunni; that is, sect is a word with a broader meaning than Sunni:

Other hypernyms of Sunni include religious order, religious sect.

Sunni (noun)	sect (noun)
one of the two main branches of orthodox Islam	a dissenting clique
a member of the branch of Islam that accepts the first four caliphs as rightful successors to Muhammad	a subdivision of a larger religious group