93 entries under noun topic. ×

57
enigma(trouble, show, difficulty, challenge)
52
conundrum(trouble, show, difficulty, challenge)
34
mystery(trouble, show, difficulty, challenge)
33
puzzle(trouble, show, difficulty, challenge)
27
problem(trouble, difficulty, challenge, question)
25
brain-teaser(trouble, challenge, question, puzzle)
21
closed book(expression, idiom, trouble, challenge)
21
poser(trouble, difficulty, challenge, question)
20
secret(trouble, challenge, question, puzzle)
17
labyrinth(secret, puzzle, complexity, maze)
17
screen(verb, separate, arrange, examine)
12
question(difficulty, secret, puzzle, obscurity)
12
sieve(verb, separate, arrangement, opening)
11
puzzlement(trouble, challenge, question, secret)
10
paradox(trouble, challenge, question, puzzle)
9
dilemma(trouble, challenge, question, puzzle)
9
mystification(trouble, challenge, question, secret)
9
strainer
8
brainteaser(difficulty, challenge, question, secret)
8
filter(verb, separate, drain, select)
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APASmart Define. (2016). riddle thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/riddle/thesaurus/synonyms
ChicagoSmart Define. 2016. "riddle thesaurus" https://smartdefine.org/riddle/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, riddle thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/riddle/thesaurus/synonyms>.
MLASmart Define. "riddle thesaurus" 1 April 2016. Web. 24 September 2026. <https://smartdefine.org/riddle/thesaurus/synonyms>