40 entries under puzzle topic. ×

14
mystery(noun, difficulty, question, secret)
10
enigma(noun, question, secret, subtlety)
7
closed book(noun, expression, idiom, question, secret)
6
riddle(noun, difficulty, question, secret)
6
secret(noun, question, perplexity, obscurity)
4
thriller(noun, question, secret, subtlety)
2
sixty-four-thousand-dollar question(expression, question, secret, subtlety)
2
tough nut to crack(expression, idiom, difficulty, question, secret)
1
abstruseness(difficulty, question, secret, subtlety)
1
brainteaser(difficulty, question, secret, subtlety)
1
braintwister(difficulty, question, secret, subtlety)
1
charade(difficulty, question, secret, subtlety)
1
chiller(noun, question, secret, subtlety)
1
cliffhanger(difficulty, question, secret, obscurity)
1
crux(difficulty, question, secret, obscurity)
1
cryptogram(difficulty, question, secret, obscurity)
1
difficulty(question, secret, obscurity, subtlety)
1
grabber(noun, difficulty, doubt, question, secret)
1
inscrutability(difficulty, question, secret, subtlety)
1
inscrutableness(difficulty, question, secret, subtlety)
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APASmart Define. (2016). whodunit thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/whodunit/thesaurus/synonyms
ChicagoSmart Define. 2016. "whodunit thesaurus" https://smartdefine.org/whodunit/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, whodunit thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/whodunit/thesaurus/synonyms>.
MLASmart Define. "whodunit thesaurus" 1 April 2016. Web. 25 September 2026. <https://smartdefine.org/whodunit/thesaurus/synonyms>