Arab chief vs sheik

Arab chief and sheik both are nouns.

Word	Noun	Adjective	Verb	Adverb
Arab chief	Yes	No	No	No
sheik	Yes	No	No	No

As nouns, Arab chief and sheik are synonyms defined as:

Other synonyms of Arab chief include sheikh, tribal sheik, tribal sheikh.

Arab chief (noun)	sheik (noun)
the leader of an Arab village or family	the leader of an Arab village or family
	a man who is much concerned with his dress and appearance