separatist

noun

1. Someone who advocates separation from the established Church; a member of any of various sects or schismatic movements.
2. A person who advocates or seeks the splitting of one country or territory into two politically independent countries or territories.

   “Near-synonym: secessionist”

   “On rare occasions French-Canadian separatists have resorted to violence.”

adj

1. (not-comparable)Advocating ecclesiastical separation.
2. (not-comparable)Advocating or seeking the separation of one country or territory into two politically independent countries or territories.

   “He is a Scottish nationalist and has a large collection of separatist literature.”