Potential answers for "Hard nut to crack"

⭐⭐⭐⭐ PECAN
⭐⭐⭐⭐ ENIGMA
⭐⭐⭐ POSER
⭐⭐⭐ ACORN
⭐⭐⭐ EASYJOB
⭐⭐⭐ HARD

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