Word: Twelver or Imami Shias

Meaning: Shias who believe in the 12 Imams 

Word: Ismaili Shias

Meaning: people who believed in the first 6 Imams, but follow a different line of Imams after Imam Jafar al-Sadiq 

Word: Proto-Sunnism

Meaning: The initial phases and building blocks of what we know as Sunnism today. Proto-Sunnism was a movement with many disparate groups that had contradicting views on law, theology and overall Islamic creed and doctrine. They were united only to the extent that they thought that the first two caliphs, Abu Bakr and Umar, were righteous