"separatist" in the noun sense
1. separatist, separationist
an advocate of secession or separation from a larger group (such as an established church or a national union)
"separatist" in the adjective sense
1. breakaway, fissiparous, separatist
having separated or advocating separation from another entity or policy or attitude
"a breakaway faction"
Source: WordNet® (An amazing lexical database of English)
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