120 entries under noun topic. ×

66
riddle(trouble, show, difficulty, challenge)
59
mystery(trouble, show, dispute, difficulty)
56
conundrum(trouble, show, difficulty, difficult)
43
puzzle(trouble, show, dispute, difficulty)
35
secret(trouble, challenge, question, puzzle)
29
problem(trouble, difficulty, issue, challenge)
29
brain-teaser(trouble, difficult, issue, challenge)
28
closed book(expression, idiom, trouble, challenge)
17
paradox(trouble, challenge, question, problem)
16
question(trouble, challenge, doubt, problem)
15
puzzlement(trouble, challenge, question, secret)
15
poser(trouble, difficulty, challenge, question)
15
puzzler(show, difficulty, difficult, issue)
15
arcanum(question, secret, dilemma, mystery)
13
mystification(trouble, challenge, question, secret)
13
perplexity(show, difficulty, question, secret)
12
stumper(trouble, difficulty, difficult, issue)
10
why(trouble, informal, challenge, question)
9
dilemma(trouble, difficult, issue, challenge)
9
crux(trouble, challenge, question, secret)
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APASmart Define. (2016). enigma thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/enigma/thesaurus/synonyms
ChicagoSmart Define. 2016. "enigma thesaurus" https://smartdefine.org/enigma/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2016, enigma thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/enigma/thesaurus/synonyms>.
MLASmart Define. "enigma thesaurus" 1 April 2016. Web. 27 September 2026. <https://smartdefine.org/enigma/thesaurus/synonyms>