Nut
Nut noun - Something that requires thought and skill for resolution.
Usage example: the question of how to increase functionality without decreasing efficiency may prove to be a tough nut to crack
Solution
Solution noun - Something attained by mental effort and especially by computation.
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Solution and Nut. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/nut/solution
Nut & Solution. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/nut/solution>.
Solution or Nut. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/nut/solution.
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