Potential answers for "Tough thing to crack"

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

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