Sunni vs. Shiʿite

noun

Islam.
  1. Also called Sunnitea member of one of the two great religious divisions of Islam, regarding the first four caliphs as legitimate successors of Muhammad and stressing the importance of Sunna as a basis for law.

  2. (used with a plural verb),  the Sunni Muslims.

noun

Islam.
  1. a member of one of the two great religious divisions of Islam that regards Ali, the son-in-law of Muhammad, as the legitimate successor of Muhammad, and disregards the three caliphs who succeeded him.