nationality: people having common origins or traditions and often comprising a nation
entity: that which is perceived or known or inferred to have its own distinct existence (living or nonliving)
organophosphate nerve agent: any of a series of nerve agents containing organophosphate compounds first synthesized by German chemists in 1936; in World War II the Germans tested them in concentration camps but not on the battlefield; Iraq is alleged to have used them against Iran and against the Kurds