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Russian word война comes from Proto-Slavic *vojь (Soldier.), Proto-Slavic *-ьnъ
*vojь (Proto-Slavic)
Soldier.
*-ьnъ (Proto-Slavic)
-ish, -ic, -al, -ed; having a particular quality of, pertaining to, associated with.
*vojьnъ (Proto-Slavic)
*vojьna (Proto-Slavic)
War.
воина (Old Russian)
война (Russian)
War, warfare.