Potential answers for "Difficult problem to crack"

⭐⭐⭐⭐ TOUGHNUT
⭐⭐⭐ POSER
⭐⭐⭐ NUT
⭐⭐⭐ THORNIEST
⭐⭐⭐ AHARDNUTTOCRACK
⭐⭐⭐ TOUGH
⭐⭐⭐ STUMPER
⭐⭐⭐ CONUNDRUM
⭐⭐ NARCS

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