Potential answers for "Tough ___ to crack"

⭐⭐⭐⭐ POSER
⭐⭐⭐⭐ ACORN
⭐⭐⭐⭐ ENIGMA
⭐⭐⭐⭐ NUT
⭐⭐⭐⭐ PECAN
⭐⭐⭐ POSERS
⭐⭐⭐ ENIGMATIC
⭐⭐⭐ HARD

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