Arab... arab is the word you're looking for you fucking imbecile. You know nothing.
Muslims are by definition people that are adherents to that religion Islam.
A= Muslim
B= Islamic
C= Arab (or w/e ethnic group you want to nit pick about, like the Kurds)
All A's are B's and all B's are A's.
Some C's are A.
Muslim:
"A Muslim (Arabic: مسلم; /ˈmʊslɨm/ MOOS-lim or English pronunciation: /ˈmʌzlɨm/ MUZ-lim) or Moslem[1] is an adherent of the religion of Islam. Literally, the word means "one who submits (to God)". Muslim is the participle of the same verb of which Islam is the infinitive."
Source: https://en.wikipedia.org/wiki/Muslim