Potential answers for "Hard ___ to crack"

⭐⭐⭐⭐ PECAN
⭐⭐⭐⭐ ENIGMA
⭐⭐⭐⭐ NUT
⭐⭐⭐⭐ TOUGHIE
⭐⭐ OPEN
⭐⭐ ACORN
⭐⭐ NARCS
⭐⭐ ONA
⭐⭐ UPAT
⭐⭐ LIVE

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