Word: Caliph

Meaning: Successor of the Prophet (s) 

Word: Caliphate

Meaning: Successorship, as in the office of successorship of the Prophet Muhammad (s)

Word: Khalifah

Meaning: Caliph 

Word: Nass

Meaning:  Designation of a Caliph or Imam by God through the intermediary of the Prophet Muhammad (s) or a living Imam.