Potential answers for "Olympian undertaking"

⭐⭐⭐⭐ PENTATHLON
⭐⭐ FOLLY
⭐⭐ TASK
⭐⭐ CAUSE
⭐⭐ COMBATMISSION
⭐⭐ POLL
⭐⭐ ODYSSEY
⭐⭐ COVERTOPERATION
⭐⭐ ACT
⭐⭐ ENDEAVOR

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