Potential answers for "Serious foe"

⭐⭐⭐⭐ NEMESIS
⭐⭐ FIRSTDEGREE
⭐ THEBAN
⭐ SMERSH
⭐ DRNO
⭐ ECOLI
⭐ DRACO
⭐ FIRPO
⭐ HANSOLO
⭐ WAR

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