42 entries under secret topic. ×

24
problem(noun, trouble, difficulty, challenge, question)
24
riddle(noun, trouble, difficulty, challenge, question)
23
enigma(noun, trouble, difficulty, challenge, question)
20
conundrum(noun, trouble, difficulty, informal, challenge)
16
mystery(noun, trouble, difficulty, challenge, question)
13
puzzle(noun, difficulty, challenge, question)
12
question(noun, difficulty, puzzle, obscurity)
11
stumper(noun, difficulty, challenge, question)
11
brainteaser(noun, difficulty, challenge, question)
7
perplexity(noun, question, puzzle, mystery)
7
puzzlement(noun, trouble, challenge, question)
7
why(noun, trouble, difficulty, challenge, question)
4
cryptogram(noun, difficulty, question, puzzle)
3
mystification(noun, trouble, challenge, question)
3
cipher
3
code
3
maze
3
stickler(noun, difficulty, challenge, question)
2
crux(difficulty, question, puzzle, obscurity)
2
sixty-four-thousand-dollar question(expression, question, puzzle, subtlety)
<123>
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APASmart Define. (2016). poser thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/poser/thesaurus/synonyms
ChicagoSmart Define. 2016. "poser thesaurus" https://smartdefine.org/poser/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2016, poser thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/poser/thesaurus/synonyms>.
MLASmart Define. "poser thesaurus" 29 March 2016. Web. 28 September 2026. <https://smartdefine.org/poser/thesaurus/synonyms>